Draw the ☣ (Biohazard Symbol)

Question

Draw the Biohazard symbol in an arbitrary colour on a distinctly coloured background. The specific proportions were published in the June 27th 1974 issue of the Federal Register of the US Government.

Details

• As output, writing to a file (raster and vector formats are permitted) or displaying on the screen are both allowed.

• You can draw just the border or the filled shape.

• If you use raster images, you should take a parameter (or two) as input that lets you adjust the resolution of the output (e.g. width/height).

• The background must at least have the size of the bounding box of the symbol but may be larger.

• Outputting the unicode symbol ☣ is not sufficient.

• The exact ratios of the used distances are given in following diagram (which was originally from here):

I also tried to make an additional diagram with the same measurements that is hopefully a little bit easier to read:

(Inspired by a post on 99%invisible)

Answer 1

T-SQL, 442 441 426 355 349 344 bytes

DECLARE @ VARCHAR(MAX)=REPLACE(REPLACE(REPLACE('DECLARE @a5MULTIPOINT((0 31),(19 -2),(-19 -2))'',@b5MULTIPOINT((0 39),(26 -6),(-26 -6))'',@5POINT(0 9)'',@d5LINESTRING(0 9,0 99,90 -43,0 9,-90 -43)''SELECT @a830%b821)%86)%d81)%d84%819))).STUnion(@827%820)).STIntersection(@b819)))'
,8,'.STBuffer('),5,' GEOMETRY='''),'%',').STDifference(@')EXEC(@)

Saved 70+ bytes by using REPLACE() for long keywords and executing as dynamic SQL. See the post-replacement code in the screenshot below.

I doubled the coordinate values from the sample illustration and moved up 9 units, to reduce the number of decimals displayed.

This was done in SQL 2017, using geo-spatial features introduced in SQL 2008. Lots of useful built-in geometry functions, including STBuffer, which gives me a simple way to define circles of different sizes around a point.

Visual of output, with annotated code:

For more T-SQL drawing, see my Easter Bunny.

For more practical applications of this tech in SQL, read this article or watch this video. SE even has a related site, gis.stackexchange.com.

Edits:

1. Saved 1 byte by changing a coordinate from 104 to 99.
2. Saved 15 bytes by taking the STDifference of a STUnion of objects, instead of each individually.
3. Saved 71 bytes by using REPLACE() on repeated keywords, then executing as dynamic SQL. Reverted Edit 2, to leave more replacements of STDifference.
4. Saved 4 bytes by moving the center up 9 units, which changed a few coordinates to single (negative) digits. This also freed up the numeral 5 to use as a replacement character instead of '#', saving 2 more bytes on the quotes.
5. Saved 5 bytes by moving ) into the STDifference replacement string; thanks, @Nicholas!

Answer 2

Tex + Tikz, 232 bytes

43 bytes saved by switching to tex. Thanks to Phelype Oleinik

Some bytes saved thanks to Skillmon

\input tikz \tikz[x=1,y=1,white]{\def\f{\foreach\1in{90:,210:,330:}}\def\u{\draw[line width=}\def~{circle(}\f\fill[red](\122)~30);\f{\u2](0,)--(\111);\u8](\130)--(\160);\fill(\130)~21);}\fill~6);\u7,red]~23.5);\f\u2](\130)~20);}\bye

With line breaks and without \def:

\input tikz
\tikz[x=1,y=1,white]{
\foreach\1in{90,210,330}\fill[red](\1:22)circle(30);
\foreach\1in{90,210,330}{
\draw[line width=2](0,0)--(\1:11);
\fill(\1:30)circle(21);
\draw[line width=8](\1:30)--(\1:60);
}
\fill(0,0)circle(6);
\draw[line width=7,red](0,0)circle(23.5);
\foreach\1in{90,210,330}\draw[line width=2](\1:30)circle(20);
}
\bye

Explanation

This is a little outdated I will fix it when I can figure out how to make the images not enourmous

Here I am going to explain how the uncompressed answer solves the problem. I may at some point explain how the compression works. First we draw the big black circles:

\foreach\x in{90,210,330}\fill(\x:21)circle(30);

Then we draw some white lines:

\foreach\x in{90,210,330}\draw[white,line width=2cm](0,0)--(\x:11);

Then we draw white circles:

\foreach\x in{90,210,330}\fill[white](\x:30)circle(21);

Then we add a central white circle:

\fill[white](0,0)circle(6);

Then we add a black annulus:

\draw[line width=7cm](0,0)circle(25.5);

Then we remove parts of the black annulus

\foreach\x in{90,210,330}\draw[white,line width=2cm](\x:30)circle(20);

Answer 3

C, 8010 bytes

Way back, before SVG or EMF, you had to deal with raster, and if you wanted something to load right away, say before the O/S was ready, like a Windows startup screen, you had to use RLE, or run-length-encoding. This monster outputs a PBM file using RLE as the data. Build like usual and run like this ./biohazard > biohazard.pbm.

If you were to include all the frameworks required to generate, e.g. the SVG engine in HTML, the Java libraries, etc. this would likely be the smallest self-contained solution, because puts is the only external function, and it's typically one of the smallest stdio.h functions.

Regarding this detail:

If you use raster images, you should take a parameter (or two) as input that lets you adjust the resolution of the output (e.g. width/height).

I interpreted "should" as different from "must", e.g. as in RFC 2119, so I didn't include scaling, because for this code it would only be feasible to do multiples of the original, e.g. ./biohazard 2 and that would introduce atoi, printf and other complications which would detract from the main focus of the submission.

int o,i,x[]=
{4946,3,33,2,389,8,33,8,378,13,33,13,369,17,33,16,363,20,33,20,356,19,41,19,350,18,49,18,344,18,55,18,339,17,61,17,334,
17,66,17,330,17,71,17,325,17,75,17,321,17,79,17,317,17,83,17,313,17,87,16,311,16,90,17,307,17,93,17,303,17,97,17,300,
17,99,17,297,17,102,18,293,18,105,17,291,18,107,18,288,17,110,18,285,18,113,17,283,18,115,18,280,18,117,18,277,19,119,
18,275,19,121,19,272,19,123,19,270,19,125,19,268,19,127,19,266,19,129,19,263,20,131,19,261,20,133,19,259,20,134,20,257,
20,136,20,255,21,137,20,253,21,139,20,251,21,141,20,249,21,142,21,248,21,143,21,246,21,145,21,244,21,146,22,242,22,147,
22,240,22,149,22,238,22,150,22,238,22,151,22,236,22,152,23,234,23,153,23,232,23,155,22,232,23,155,23,230,23,157,23,228,
24,157,24,226,24,159,23,226,24,159,24,224,24,160,25,222,25,161,24,222,24,162,25,220,25,163,25,219,25,163,25,218,25,164,
26,216,26,165,25,216,26,165,26,214,26,166,26,214,26,167,26,212,27,167,26,212,26,168,27,210,27,169,27,209,27,169,27,208,
27,170,28,207,27,170,28,206,28,171,27,206,28,171,28,204,29,171,28,204,28,172,29,202,29,172,29,202,29,173,29,201,29,173,
29,200,30,173,29,200,30,173,30,198,31,173,30,198,30,174,31,197,30,174,31,196,31,174,31,196,31,175,31,195,31,175,31,194,
32,175,31,194,32,175,32,193,32,175,32,193,32,175,32,192,33,175,32,192,33,175,33,191,33,175,33,190,34,175,33,190,34,175,
33,190,34,175,34,189,34,174,35,189,34,174,35,188,35,174,35,188,35,174,36,187,36,173,36,187,36,173,36,187,36,173,36,186,
37,74,25,74,36,186,37,67,39,67,36,186,37,62,49,61,38,185,37,58,57,57,38,185,38,53,64,54,38,185,38,50,71,50,38,185,38,
47,76,48,38,185,38,45,81,44,39,184,40,41,87,41,39,184,40,39,91,39,39,184,40,37,95,37,39,184,40,35,99,34,41,183,41,32,
103,32,41,183,41,30,107,30,41,183,41,28,111,27,42,183,42,25,115,25,42,183,42,24,117,24,42,183,42,22,121,21,43,183,43,
19,124,20,43,183,43,18,127,18,43,183,43,17,129,16,44,183,44,14,133,14,44,183,44,13,135,12,45,183,45,11,137,11,45,183,
45,10,139,9,46,183,46,9,138,10,46,183,46,10,137,9,47,183,47,9,136,10,47,183,47,10,135,9,48,183,48,10,56,20,57,10,48,
183,49,9,50,33,49,10,48,184,49,10,45,41,45,10,48,184,50,10,40,49,40,10,49,184,50,10,37,55,36,10,50,185,50,10,33,60,34,
10,50,185,51,10,30,65,30,10,51,185,51,11,27,69,27,10,52,185,52,10,25,73,24,11,52,185,53,10,22,77,21,11,53,185,53,11,19,
81,19,10,53,186,54,11,16,85,16,10,54,185,56,11,13,88,14,11,56,181,59,11,11,91,11,11,59,176,63,11,8,94,9,11,63,171,66,
11,6,97,6,11,66,167,68,12,4,99,4,11,69,163,71,12,1,102,2,11,72,159,74,126,75,155,77,124,78,151,80,123,79,149,82,120,83,
145,85,118,86,141,88,116,88,139,90,114,91,135,93,112,93,133,96,109,96,130,98,107,98,127,101,104,102,124,104,101,104,
122,106,99,106,119,110,95,109,117,112,93,112,114,115,89,115,112,118,85,118,110,120,82,121,107,124,78,124,105,127,74,
127,103,131,69,130,101,134,65,133,99,137,60,137,97,141,54,141,95,146,47,145,93,151,39,150,91,157,29,156,89,166,13,165,
88,168,9,168,86,169,9,169,84,170,9,170,82,171,9,171,80,172,9,171,79,173,9,172,78,173,9,173,76,174,9,174,74,175,9,175,
72,176,9,175,72,176,9,176,70,177,9,177,68,64,20,93,10,94,20,63,68,57,34,83,17,83,33,58,66,54,42,77,21,76,43,54,64,51,
50,71,25,71,49,51,64,48,57,65,29,65,56,49,62,46,63,61,31,61,62,47,60,45,67,58,33,58,67,44,60,43,71,55,35,54,72,43,58,
41,36,8,32,52,37,51,33,8,35,41,58,40,36,17,26,49,39,48,27,16,37,40,56,39,38,22,23,46,41,45,24,21,39,39,55,37,40,26,21,
43,42,44,21,26,40,37,54,36,42,29,20,41,43,41,20,29,42,36,53,35,43,29,21,39,44,39,22,29,43,35,52,34,45,29,23,37,45,37,
23,29,45,34,51,33,46,29,24,35,46,35,25,29,46,33,50,32,48,29,26,33,47,33,26,29,47,33,49,31,49,29,27,32,47,32,27,29,49,
31,48,31,49,30,28,30,48,30,29,29,50,31,47,29,51,30,30,28,49,28,30,29,51,30,46,29,52,29,32,27,49,27,31,29,53,28,46,28,
53,29,33,26,49,26,32,29,54,28,44,28,54,29,34,25,49,25,33,29,55,27,44,27,55,29,35,24,49,23,35,29,56,27,43,26,56,29,36,
22,50,22,36,29,57,26,42,26,57,29,37,21,50,21,37,29,58,26,41,25,58,29,38,21,49,20,38,29,59,25,40,25,59,29,39,20,49,19,
39,29,60,24,40,24,60,29,40,19,49,19,39,29,61,24,39,23,61,29,41,18,49,18,40,29,62,23,38,23,62,30,41,17,49,17,41,29,63,
22,38,22,63,30,42,16,48,17,42,29,63,23,37,21,65,29,43,16,47,16,43,29,64,22,36,22,65,29,43,16,47,15,44,29,65,21,36,21,
66,29,44,13,50,14,44,29,66,21,35,20,67,29,45,11,53,11,45,29,67,20,34,20,68,29,46,8,57,8,46,29,67,20,34,20,68,29,46,6,
61,5,46,30,68,19,34,19,69,29,47,4,63,4,46,30,69,19,33,18,70,30,47,1,67,1,47,29,70,19,32,19,70,30,163,29,71,18,32,18,71,
30,61,2,37,2,61,29,72,18,31,17,73,29,59,5,35,5,58,30,72,18,31,17,73,29,58,7,33,7,57,30,73,17,30,17,74,30,55,10,31,10,
55,30,73,17,30,17,74,30,53,13,28,14,53,30,74,16,30,16,75,30,51,17,25,16,52,29,75,17,29,16,76,29,50,20,21,19,50,30,76,
16,29,15,77,30,50,21,16,22,50,30,77,15,29,15,77,30,50,26,7,25,51,30,77,15,28,15,78,30,51,57,50,30,78,15,28,15,78,31,50,
56,51,30,79,15,27,14,80,30,51,55,51,30,79,15,27,14,80,30,51,55,50,31,80,14,27,13,81,31,51,53,51,30,81,14,27,13,82,30,
51,53,51,30,82,13,27,13,82,31,50,52,51,31,82,13,26,13,83,31,51,51,51,31,82,13,26,13,83,31,51,51,50,31,84,12,26,13,84,
31,50,50,51,31,84,12,26,12,85,31,51,49,50,32,84,13,25,12,85,32,50,49,50,31,86,12,25,12,86,31,50,48,50,32,86,12,25,11,
87,32,50,47,50,32,86,12,25,11,87,32,50,47,49,32,88,11,25,11,88,32,49,47,49,32,88,11,25,11,88,32,49,46,49,32,89,11,25,
10,90,32,49,45,49,32,89,11,25,10,90,33,48,45,48,33,90,10,25,10,91,32,48,45,47,33,91,10,25,10,91,33,47,44,48,33,91,10,
25,10,91,34,46,44,47,33,92,10,25,9,93,33,47,43,46,34,92,10,25,9,93,34,46,43,46,33,93,10,25,9,94,34,45,43,45,34,94,9,25,
9,94,35,44,43,44,34,95,9,25,9,95,34,44,42,44,35,95,9,25,9,95,35,43,42,44,34,96,9,25,9,96,35,42,42,43,35,96,9,25,8,97,
36,42,41,42,35,97,9,25,8,98,36,41,41,41,36,97,9,25,8,99,36,40,41,40,36,98,8,26,8,99,37,39,41,39,36,99,8,26,8,100,37,38,
41,38,37,99,8,27,7,100,38,37,41,37,37,101,7,27,7,101,38,36,41,36,38,101,7,27,7,102,38,35,41,35,38,102,7,27,7,102,39,34,
41,34,38,103,7,27,7,103,39,33,41,33,39,103,7,27,7,104,39,32,41,32,39,104,7,27,7,104,41,30,41,30,40,104,7,29,6,105,41,
29,41,29,40,105,7,29,6,106,41,28,41,28,41,105,7,29,6,107,42,26,41,26,42,106,7,29,6,108,42,25,41,25,42,107,7,29,7,107,
44,22,42,23,43,108,6,30,7,108,44,21,42,21,45,108,6,31,6,109,45,19,42,20,45,109,6,31,6,110,46,17,43,17,46,110,6,31,6,
111,47,15,43,15,47,111,6,31,6,112,48,13,43,13,48,112,5,33,5,113,49,11,43,10,50,112,6,33,5,114,50,9,43,9,50,113,6,33,6,
113,50,8,44,9,49,114,6,33,6,114,48,9,45,8,48,115,5,35,5,115,47,9,45,8,47,116,5,35,5,117,45,8,46,9,45,116,6,35,6,117,44,
8,46,9,44,117,5,37,5,118,42,9,47,8,43,118,5,37,5,119,41,9,47,9,41,119,5,37,5,120,40,8,48,9,40,119,5,39,5,120,39,8,48,9,
38,121,5,39,5,121,37,9,49,8,37,122,5,39,5,123,35,9,49,9,35,123,4,41,5,123,34,8,50,9,34,123,5,41,5,124,32,9,51,9,31,125,
5,42,3,127,30,9,51,9,30,127,3,43,1,130,28,9,52,9,29,130,1,176,26,9,53,9,26,310,24,9,54,9,24,314,22,9,55,9,22,317,20,9,
55,9,20,320,18,9,56,10,17,324,15,10,57,9,16,327,13,9,58,10,13,331,10,10,59,9,11,335,8,9,60,10,8,339,5,10,61,9,6,344,2,
9,62,10,2,358,63,368,65,367,65,366,67,365,67,364,69,362,70,362,71,360,73,358,75,356,76,356,77,354,79,352,81,350,82,349,
84,215,2,130,86,130,3,79,5,129,87,128,6,77,6,127,89,126,6,79,6,125,91,124,7,80,6,123,93,122,7,82,6,121,95,120,7,84,6,
119,97,118,7,86,7,115,100,116,7,87,8,113,102,114,7,89,8,111,105,111,7,91,8,109,107,109,7,93,8,107,109,106,9,94,9,103,
112,104,9,96,9,101,115,101,9,98,10,97,118,98,10,100,10,95,121,95,10,102,11,91,124,92,11,104,11,89,127,88,11,107,12,85,
131,85,11,110,12,81,135,81,12,112,13,77,138,78,13,114,14,73,143,73,14,116,15,69,72,2,73,69,15,118,17,63,74,5,73,64,16,
122,17,59,75,7,75,58,18,124,19,53,77,9,77,53,19,126,22,45,79,13,78,46,21,130,24,37,82,15,81,38,24,132,28,27,85,18,86,
27,28,135,37,5,95,21,95,5,37,138,134,24,135,141,131,27,131,144,128,31,127,148,124,34,125,151,121,37,121,155,117,41,117,
159,113,45,113,163,109,49,109,167,105,53,105,171,101,57,101,175,96,62,96,181,91,67,91,185,86,72,86,191,80,78,81,196,74,
84,74,204,67,91,67,211,59,99,59,219,51,107,51,228,40,119,39,242,25,133,25,5311,0};
main(){for(puts("P1\n432 408");x[i];++i,o=!o)while(x[i]--)puts(o?"0":"1");}

Answer 4

TeX + TikZ, 234 230 226 bytes

Originally 5 bytes longer than Sriotchilism O'Zaic's answer, but this one should be correct. It is similar to his answer but saves a few bytes more here and there, it needs one \draw[line width=8] more (in the code below this is done by \28](~30)to(~55);, that's 17 bytes added only for this) to get the tips of the symbol right, hence the 5 bytes more overall code length.

And thanks to Sriotchilism O'Zaic I reread some of the question and realized I can change the colour to red, so that saves a few bytes again:

\input tikz\let~\def~\1{circle(}~\2{\draw[line width=}~~{\foreach~in{90:,210:,330:}}\tikz[x=1,y=1,white]{~\fill[red](~22)\130);~{\fill(~30)\121);\28](~30)to(~55);\22](~0)to(~10);}\fill\16);\27,red]\123.5);~\22](~30)\120);}\bye

TeX-g + TikZ, 195 Bytes

Just if someone cares, the following uses a TeX-based code golf dialect that I'm working on (don't consider the code stable). The byte count includes EOL characters and the EOF character, as those are semantically used (EOL delimits arguments of loops). The dialect is pretty small up until now and only features shorthands for definitions and a for-loop syntax, however it is not specifically written for this answer, so it shouldn't break the rules of code golfing. Repository for the -g.tex-package/file: https://github.com/Skillmon/TeX-g

\input-g <tikz>~"{\:~{90:,210:,330:}}~'{circle(}~_{\draw[line width=}!f\fill\tikz[x=1,y=1,white]{"f[red](~22)'30);
"f(~30)'21);_8](~30)to(~55);_2](~0)to(~10);
f'6);_7,red]'23.5);"_2](~30)'20);
}

Output of both code snippets looks identical:

(too lazy to update the image, just imagine it being red)

Answer 5

SVG(HTML5), 434 410 321 306 bytes

<svg viewbox=-60,-60,120,120><circle r=23.5 stroke-width=7 fill=#fff stroke=#000 /><use href=#g transform=scale(-1,1) /><g id=g><use href=#p transform=rotate(120) /><use href=#p transform=rotate(240) /><path id=p stroke=#fff stroke-width=2 d=M5,0A5,5,0,0,0,0,-5V-10A20,20,0,0,0,2,-50V-53A31,31,0,0,1,31,-17

Now based on @LevelRiverSt's SVG. Edit: Saved 12 bytes thanks to @G0BLiN.

Answer 6

Processing, 371 368 bytes

translate(width/2,width/2);scale(width/99);int i=0,b=204;float t=TAU/3;noStroke();for(;i<3;i++){fill(0);ellipse(0,-22,60,60);rotate(t);}for(;i<6;i++){fill(b);rect(-4,-60,8,16);ellipse(0,-30,42,42);rotate(t);}ellipse(0,0,12,12);stroke(0);strokeWeight(7);noFill();ellipse(0,0,47,47);for(;i<9;i++){strokeWeight(2);stroke(b);ellipse(0,-30,40,40);line(0,0,0,-9);rotate(t);}

I wasn't sure if Processing should count as rasterized or not for the purpose of this challenge. If it counts as rasterized, the translate and scale is necessary to make the symbol legible and on-screen for a given window size. But, because all of the drawing commands are vectorized, it works at any given scale; so if we assume drawing at the relative origin to be about 200 units wide is fine, the first 43 bytes can be dropped.

This assumes the background color is 204, 204, 204, which is the default background color in processing. It also assumes a rectMode of CORNER and an ellipseMode of CENTER (the defaults)

With an initial size(640, 640), the resulting sketch looks like this:

By doubling the scale, I saved 3 bytes, because .5s are eliminated (though several numbers do flow from 1 digit to 2 digit).

The construction is similar to the TeX solution, drawing black and then gray on top to "erase" the gaps between the shape.

Explanation:

translate(width/2,width/2); // Move to the middle of the canvas
scale(width/99);            // Scale up to fill the canvas

int i=0,b=204;              // Initialize i, and `b` to the background color
float t=TAU/3;              // Save a rotation of one third, in radians

noStroke();
for(;i<3;i++){ // Draw the three big black circles
  fill(0);
  ellipse(0,-22,60,60);
  rotate(t);
}
for(;i<6;i++){
  fill(b);
  rect(-4,-60,8,16);     // "Blunt" the corners on the sharp outer rings
  ellipse(0,-30,42,42); // Cut out the middle of the big circles
  rotate(t);
}
ellipse(0,0,12,12); // Cut out the small circle in the middle
stroke(0);
strokeWeight(7);
noFill();
ellipse(0,0,47,47); // Draw the thick band that goes through all three big circles
for(;i<9;i++){
  strokeWeight(2);
  stroke(b);
  ellipse(0,-30,40,40); // Cut the "gap" between the three big rings
                        //and the band passing through them
  line(0,0,0,-16);      // Cut the lines coming out of the small middle circle
  rotate(t);
}

Answer 7

GLSL, 700 629 564 545 499 bytes

#define v vec2
#define j(x,r)length(x-g)<r
#define k(x,r,q)j(x,q)!=j(x,r)
#define l(b)length(g-b)<1.&&length(g-dot(g,b)*b)<(length(g)<S?A*S:A/S)
float C=.86,S=.5,F=.3,E=.22,A=.02,G=.21;void mainImage(out vec4 o,in v p){v r=iResolution.xy;v g=(p/S-r)/r.y;o.g=(k(v(0,F),G,G-A)||k(v(F*C,-F*S),G,G-A)||k(v(-F*C,-F*S),G,G-A))?o.g=0.:k(v(0),F,G)?C:l(v(0,1))||l(v(C,-S))||l(v(-C,-S))||j(v(0),.06)||j(v(0,F),G)||j(v(F*C,-F*S),G)||j(v(-F*C,-F*S),G)?0.:j(v(0,E),F)||j(v(E*C,-E*S),F)||j(v(-E*C,-E*S),F)?C:0.;}

I was playing around with Shadertoy, so I tried the GLSL shading language. The code just rasterizes circles and lines by testing each fragment, and assigns them a value of one or zero. The size was cut down from >1000 bytes by heavy use of macros.

Shadertoy program

Answer 8

GLSL, 319 310 bytes

#define F float
#define H(y)sqrt(x*x+(y)*(y))
void mainImage(out vec4 D,in vec2 u){vec2 U=u*.003-.5;F x=abs(U.x),y=U.y;if(y<.577*x){F t=.5*x+.866*y;y=.866*x-.5*y;x=abs(t);}F c=F(H(y-.11)<.15);F R=H(y);F S=H(y-.15);if(S<.105)c=0.;if(R<.03)c=0.;if(x<(R<.1?.005:.02))c=0.;if(R>.10&&R<.135&&S<.095)c=1.;D=vec4(c);}

This can be rendered on Shadertoy.

You can use the symmetry in the image to draw it with a smaller amount of separate shapes.

Here is a somewhat inflated version:

#define F float
#define H(y) sqrt(x*x+(y)*(y))

void mainImage(out vec4 D,in vec2 u)
{
    // normalized UV
    vec2 U = u*.003 - .5;

    // fold the 6 identical sections to the same UV coordinates
    F x = abs(U.x), y = U.y;
    if (y < .577*x)
    {
        F t = .5*x + .866*y;
        y = .866*x - .5*y;
        x = abs(t);
    }

    // circles and lines
    F c = F(H(y-.11) < .15);
    F R = H(y);
    F S = H(y-.15);
    if (S < .105) c = 0.;
    if (R < .03) c = 0.;
    if (x < (R < .1 ? .005 : .02)) c = 0.;
    if (R > .10 && R < .135 && S < .095) c = 1.;

    // output
    D = vec4(c);
}

---

(thanks to @Kevin Cruijssen for removing some unnecessary whitespace)

Answer 9

HTML / JS,  448 435 433  387 bytes

Saved many bytes by using @Neil's pre-minimized version of the SVG
Saved 2 bytes thanks to @Shaggy

A compressed version of this SVG file from Wikimedia Commons.

<body onload="_=`<svg~12y~24y><path id=p d=m28.8117,27.046a3,3}0qb3117q4.004v-1w539|1wq20.7959v-w583a1jxb7975x7.3228xj,8.6032x9.7443l-.4835q.2792|-18.7598q9.0989zm3.4148q8.871a10x0}0q1b453,c9w,9w{-kx3wx3w}1x6.8042,0x0x0{k>~><use href=#p transform=rotate(},cc|a10wx0w}c{}1qb1756,yc26,26) /x,1w.5q,-kb7417j5x5}1c0,b2.`;for(i of`bcjkqwxy{|}~`)with(_.split(i))_=b.innerHTML=join(pop())"id=b>

Try it online! (just outputs the decompressed string)

Demo snippet

setTimeout(_ => document.getElementsByTagName('svg')[0].setAttribute("viewBox", "0 0 100 100"), 0)

<body onload="_=`<svg~12y~24y><path id=p d=m28.8117,27.046a3,3}0qb3117q4.004v-1w539|1wq20.7959v-w583a1jxb7975x7.3228xj,8.6032x9.7443l-.4835q.2792|-18.7598q9.0989zm3.4148q8.871a10x0}0q1b453,c9w,9w{-kx3wx3w}1x6.8042,0x0x0{k>~><use href=#p transform=rotate(},cc|a10wx0w}c{}1qb1756,yc26,26) /x,1w.5q,-kb7417j5x5}1c0,b2.`;for(i of`bcjkqwxy{|}~`)with(_.split(i))_=b.innerHTML=join(pop())"id=b>

Answer 10

Haskell, 530 491 436 435 430 420 bytes

f=fromIntegral
c(a,b)r(x,y)=(x-a)^2+(y-b)^2<r^2
(m#w)t(x,y)|c<-cos(-t),s<-sin(-t)=x*c-y*s>m&&abs(x*s+y*c)<w/2
u a p=any($p)a
i a p=all($p)a
v=(*(pi/6))<$>[9,5,1]
o=c(0,0)
h?r=[c(h*cos a,h*sin a)r|a<-v]
(h%y)x|u[i[u$11?15,(not.)$u$o 3:map(0#1)v++map(9#4)v++15?10.5],i[o 13.5,not.(o 10),u$15?9.5]](60*f x/h-30,60*f y/h-30)="0 "|0<1="1 "
g h|s<-show h,n<-[0..h-1]=writeFile"a.pbm"$unlines$"P1":(s++' ':s):[n>>=(f h%)y|y<-n]

Outputs a PBM file.

This was a lot of fun!

(I had to convert this to PNG to upload to imgur)

Basically we create our own vector graphics functions which render onto an image pixel by pixel by detecting whether the pixel is part of the shape. The shape is constructed as a bunch of circles and lines (radiating from the origin) held together with basic set operations: union, intersection, and not. The circles are composed of their center and a radius, and the lines have a minimum radius, a width, and an angle in that order. Detecting membership in a circle is easy: I just subtract the center coords and compare the magnitude to the radius. The line is slightly more complicated: I rotate the point by the opposite of the angle to bring it (to nullify the rotation) then I just check whether the x and y coordinates fall within the expected range. The minimum radius is to ensure the larger gap at the far ends of the large circles does not overrule the small gaps near the center. After that it's a simple matter of boolean logic to do set math.

EDIT: Thanks a lot to @flawr for taking off 39 bytes!

EDIT2: Thanks a lot to @Christian Sievers for taking off 55 bytes! Good idea making them into functions

EDIT3: Thanks again to @Christian Sievers for shaving off another byte!

EDIT4: Took off 7 bytes thanks to @H.PWiz and @Angs!

EDIT5: Just noticed a bug! I was rendering the lines twice as thick as they were supposed to be! Cost me 2 bytes to fix it (had to divide width by 2; could've adjusted the constant values but changing 1 to 0.5 would also cost 2).

EDIT6: Thanks @Angs for taking off another 10 bytes!

Answer 11

PostScript, 367 359 328 271 bytes

Code (compressed version):

5 5 scale 36 24 translate <</c{0 360 arc closepath}/r{120 rotate}/R{repeat}/L{setlinewidth}/g{setgray}/F{fill}>>begin 3{0 11 15 c F r}R 1 g 3{0 15 10.5 c F r}R 0 0 3 c F 3{[-.5 2 1 3 -2 25 4 3]rectfill r}R 0 g 4 L 0 0 11.5 c stroke 1 g 1 L 3{0 15 10 c stroke r}R showpage

Code (uncompressed version):

5 5 scale                  % over-all scale
36 24 translate            % over-all shift

% define some short-named procedures for later use
<<
  /c { 0 360 arc closepath }  % append circle (x, y, radius are taken from stack)
  /r { 120 rotate }           % rotate by 120°
  /R { repeat }
  /L { setlinewidth }
  /g { setgray }
  /F { fill }
>> begin

3 {
    0 11 15 c F       % black circle
    r                 % rotate by 120°
} R
1 g                   % set white color
3 {
    0 15 10.5 c F     % white circle
    r                 % rotate by 120°
} R
0 0 3 c F             % small white circle
3 {
    [ -.5 2 1 3       % white gap near center
      -2 25 4 3       % white gap on edge
    ] rectfill
    r                 % rotate by 120°
} R
0 g                   % set black color
4 L                   % set linewidth 4
0 0 11.5 c stroke     % black ring
1 g                   % set white color
1 L                   % set linewidth 1
3 {
    0 15 10 c stroke  % white ring
    r                 % rotate by 120°
} R
showpage

Result (as animation to see how it is drawn):

Answer 12

Ruby, 278 bytes

puts"<svg viewBox='-60-60 120 120'><circle cx='0'cy='0'r='23.5'stroke-width='7'fill='white'stroke='red'/>",(-3..5).map{|i|"<path fill='red'stroke='white'stroke-width='2'd='M5 0A5 5 0 0 1 0 5v5A20 20 0 0 1 2 50v3A31 31 0 0 0 31 17'transform='scale(#{i/3},-1)rotate(#{i*120})'/>"}

Try it online!

Generates the SVG code below, with the symbol being at 200% of the scale in the OP.

It consists of a circle at the back, and the prongs in the foreground. The prong is scaled -1,0,1 in the X axis and rotated through multiples of 120 degrees. The cases where the X scaling is zero produce no output, while the -1 and +1. provide the two sides of each pair of prongs.

Use is made of a 2-unit wide white border around the prong to cut the back circle, using the stroke and stroke-width attributes. In order for the internal shape to be per the OP, the coordinates are moved by 1 unit (half the width of the border.) Note that the path is deliberately not closed, to suppress the drawing of the final line of the border. This ensures the two halves of each pair of prongs join together.

90 degrees of the inner circle are drawn rather than the expected 60, for golfing reasons. This means there is some overlap between the bases of each pair of prongs, but this does not affect the appearance of the output shape.

<svg viewBox='-60-60 120 120'><circle cx='0'cy='0'r='23.5'stroke-width='7'fill='white'stroke='red'/>
<path fill='red'stroke='white'stroke-width='2'd='M5 0A5 5 0 0 1 0 5v5A20 20 0 0 1 2 50v3A31 31 0 0 0 31 17'transform='scale(-1,-1)rotate(-360)'/>
<path fill='red'stroke='white'stroke-width='2'd='M5 0A5 5 0 0 1 0 5v5A20 20 0 0 1 2 50v3A31 31 0 0 0 31 17'transform='scale(-1,-1)rotate(-240)'/>
<path fill='red'stroke='white'stroke-width='2'd='M5 0A5 5 0 0 1 0 5v5A20 20 0 0 1 2 50v3A31 31 0 0 0 31 17'transform='scale(-1,-1)rotate(-120)'/>
<path fill='red'stroke='white'stroke-width='2'd='M5 0A5 5 0 0 1 0 5v5A20 20 0 0 1 2 50v3A31 31 0 0 0 31 17'transform='scale(0,-1)rotate(0)'/>
<path fill='red'stroke='white'stroke-width='2'd='M5 0A5 5 0 0 1 0 5v5A20 20 0 0 1 2 50v3A31 31 0 0 0 31 17'transform='scale(0,-1)rotate(120)'/>
<path fill='red'stroke='white'stroke-width='2'd='M5 0A5 5 0 0 1 0 5v5A20 20 0 0 1 2 50v3A31 31 0 0 0 31 17'transform='scale(0,-1)rotate(240)'/>
<path fill='red'stroke='white'stroke-width='2'd='M5 0A5 5 0 0 1 0 5v5A20 20 0 0 1 2 50v3A31 31 0 0 0 31 17'transform='scale(1,-1)rotate(360)'/>
<path fill='red'stroke='white'stroke-width='2'd='M5 0A5 5 0 0 1 0 5v5A20 20 0 0 1 2 50v3A31 31 0 0 0 31 17'transform='scale(1,-1)rotate(480)'/>
<path fill='red'stroke='white'stroke-width='2'd='M5 0A5 5 0 0 1 0 5v5A20 20 0 0 1 2 50v3A31 31 0 0 0 31 17'transform='scale(1,-1)rotate(600)'/>

Answer 13

Python 3 with pygame, 327 314 287 278 bytes

(Applied various nasty hacks to save 13 bytes; most notably no longer storing the color but calculating it on the fly with -(r>25))
(Refactored to function, losing sys; hacked out math in favour of coordinate constants; small tweaks; saved 27 bytes)
(Rewrote coordinate constants to complex math tricks to get (co)sine, saving 9 bytes)

Function that takes a single integer argument representing half the width/height of the resulting image. E.g. f(500) will create a 1000x1000 pixel window, and draw a biohazard symbol in there.

from pygame import*;D=display
def f(S):
 u=D.set_mode([S*2]*2);b=S>>6
 for p,r,w in(22,30,0),(30,20,0),(0,27,7),(30,21,2),(0,6,0),(51,4,0):
  for l in 0,4/3,8/3:Z=1j**l*p*b;q=S+int(Z.imag),S-int(Z.real);draw.circle(u,-(r>25),q,r*b,w*b);r-20or draw.line(u,0,(S,S),q,b*2);D.flip()

Unshortened version:

import pygame
import math
import sys

size = int(sys.argv[1])
basic = size // 55

screen = pygame.display.set_mode((size * 2, size * 2))

circles = [
    (22, 30, 0, -1),  # basic shape
    (30, 20, 0, 0),   # large cutouts
    (0, 27, 7, -1),   # "background circle"
    (30, 21, 2, 0),   # "background circle" clearance
    (0, 6, 0, 0),     # center disc
    (51, 4, 0, 0),    # blunt the points
]

for pos, radius, width, color in circles:
    for lobe in [0, math.pi * 2 / 3, math.pi * 4 / 3]:
        x = int(math.sin(lobe) * pos * basic) + size
        y = size - int(pos * basic * math.cos(lobe))
        pygame.draw.circle(screen, color, (x, y), radius * basic, width * basic)
        # Hack to draw the small slots in the center
        if radius == 20:
            pygame.draw.line(screen, 0, (size, size), (x, y), basic * 2)

pygame.display.flip()

The key to this program is mostly exploiting the 3-way point symmetry of the symbol, and expressing the drawing operations as sparsely as possible. The heart of it all is circles, which is a list of circle definitions, consisting just of:

• position: how far outwards from the origin in half basic units
• radius: the radius of the circle in half basic units
• width: the border width of the circle (inwards from the outer circle, 0 = fill)
• color: exploiting the fact that pygame interprets 0 as black and -1 as white

Every drawing operation is repeated three times, rotated 120°. The blunting of the "claws" is done with another circle. The inside "line cuts" are special-cased because I couldn't think of a more efficient way to get them in there. The "basic unit" defined in the specification is doubled here so I didn't have to use .5 in circles and int() all over the place to satisfy pygame.

Result for python3 -c 'from biohazard import *; f(500)':

Answer 14

Tcl/Tk - 557 bytes

set F #000
set B #F50
pack [canvas .c -bg $B]
rename expr e
rename foreach f
rename proc p
p R r {list [e $r*cos($::a)] [e $r*sin($::a)]}
p D {d r} {lassign [R $d] x y;list [e $x-$r] [e $y-$r] [e $x+$r] [e $y+$r]}
p C {d r c} {.c cr o {*}[D $d $r] -f $c -outline $c}
p L {p q w} {.c cr l {*}[R $p] {*}[R $q] -w [e $w] -f $::B}
p A {d r w c} {.c cr a {*}[D $d $r] -w [e $w] -star 0 -ex 359.9 -sty arc -outline $c}
f x {{C 11 15 $F} {C 15 10.5 $B} {L 0 5 1} {L 20 40 4} {C 0 3 $B} {A 0 11.75 3.5 $F} {A 15 10 1 $B}} {f a {2.62 4.72 6.81} $x}
.c move all 99 99

That version, however, is boring, since you get the same small-sized image no matter what. It does satisfy the OP conditions for displaying on-screen, however. Here is the uncompressed version with commentary and the ability to specify a size added in:

# Input: command line argument is the pixel width (same as the height) of the window to create
# For example:
#   wish a.tcl 500
set window_size $argv

set foreground_color #000
set background_color #F50
pack [canvas .c -bg $background_color -width $window_size -height $window_size]

# Helper procs to generate x,y coordinates
proc radius->x,y r {
  list [expr {$r*cos($::angle)}] [expr {$r*sin($::angle)}]
}

proc center_offset,radius->rectangle {offset r} {
  lassign [radius->x,y $offset] x y
  list [expr {$x-$r}] [expr {$y-$r}] [expr {$x+$r}] [expr {$y+$r}]
}

# Tk's canvas does not scale line widths, so we have to do that manually
# The $scale is a global variable for compressing the code text above
set scale [expr {$window_size*.016}]

# These three procs draw items in the canvas
proc circle {offset r color} {
  .c create oval {*}[center_offset,radius->rectangle $offset $r] -fill $color -outline $color
}
proc line {p q w} {
  .c create line {*}[radius->x,y $p] {*}[radius->x,y $q] -width [expr {$::scale*$w}] -fill $::background_color
}
proc annulus {offset r w color} {
  .c create arc {*}[center_offset,radius->rectangle $offset $r] -width [expr {$::scale*$w}] -start 0 -extent 359.9 -style arc -outline $color
}

# Our list of shapes to draw
#  circle  center_offset, radius,                   color
#  line    end_offset_1,  end_offset_2, line_width
#  annulus center_offset, radius,       line_width, color
foreach command {
  {circle  11 15        $foreground_color}
  {circle  15 10.5      $background_color}
  {line     0  5    1}
  {line    20 40    4}
  {circle   0  3        $background_color}
  {annulus  0 11.75 3.5 $foreground_color}
  {annulus 15 10    1   $background_color}
} {
  # Each command gets applied thrice, rotated $angle radians each time
  foreach angle {2.62 4.72 6.81} $command
}

.c scale all 0 0 $scale $scale
.c move all [expr {$window_size/2}] [expr {$window_size/2}]

# Some random convenience stuff for playing with it
bind . <Escape> exit
after 500 {focus -force .}

Sorry, no pictures (working off my phone today). Produces a black symbol on a biohazard orange background.

Answer 15

C (gcc) (MinGW), 557 530 524 522 bytes

-27 -6 bytes thanks to ceilingcat

Added compiler option -lm on TiO strictly to be able to show how it runs. Under MinGW this is not necessary.

Takes width of image as a command line argument. Outputs a 3-shade greyscale PGM file to STDOUT. The circle drawing function is slightly longer than it could be, to avoid dreadful runtime on even moderately sized images, the positioning/scaling of the symbol is not perfect, and I suspect shuffling the draw order somewhat might squeeze some more out of this, so there is room for improvement for sure.

Everything is drawn as circles. The rectangular cutouts are painted using the circle drawing function as a moving brush.

char*I;q,j=5,r,c;N(n){n="F=**(..*(C/)F<<*>FF)"[j*4+n]-40;}float d,b,m,x,y,V=2.0944;C(x,y,R,t,z)float x,y,R,t;{for(r=y<R?0:y-R;r<=y+R;r++)for(c=x-R;c<=x+R;c++)d=hypot(c-x,r-y),d<R&d>=R-t?I[r*q+c]=z:0;}main(i,v)int**v;{q=atoi(v[1]);b=q/104.;m=q/2.;for(I=memset(calloc(q,q+1),2,q*q);i=j--;)for(x=0;x<7;x+=V)C(m+cos(x)-N(0)*b*sin(x),m-N(0)*b*cos(x)+sin(x),N(1)*b,N(2)*b,N(3));for(;i<3;i++)for(j=m;j--;C(m-x,m-y,d,d=d>4*b&d<10*b?b:d>50*b?b*4:0,2))d=hypot(x=j*sin(x)-cos(x),y=j*cos(x=i*V)-sin(x));printf("P5 %d %d 2 %s",q,q,I);}

Try it online!

Answer 16

Wolfram Language (Mathematica), 211 209 bytes

RegionPlot[#2>6&&Norm[#-{22,0}]<30&&Norm[#-{30,0}]>21&&!-1<#[[2]]<1&&!(-4<#[[2]]<4&&#[[1]]>20)||20<#2<27&&Norm[#-{30,0}]<19&@@{#{Cos@#2,Sin@#2},#}&@@{#,Mod[#2,2Pi/3]-Pi/3}&@@AbsArg[I*x-y],{x,s=52,-s},{y,-s,s}]

Here exported with the additional option PlotPoints -> 100 to make it look more accurate: