Diamonds (suit)

Diamonds is one of the four suits of playing cards in the standard French deck. It is the only French suit to not have been adapted from the German deck, taking the place of the suit of Bells .

A hand of four sevens. The 7 of Diamonds is the leftmost card.

The original French name of the suit is Carreau; in German it is known as Karo.

In older German-language accounts of card games, Diamonds are frequently referred to as Eckstein ("cornerstone"). In Switzerland, the suit is still called Egge (=Ecke i.e. "corner") today. The term "Karo" went into the German language in the 18th century from the French carreau, which goes back to the Latin word, quadrum, meaning "square" or "rectangle".[1]

Characteristics

The diamond typically has a lozenge shape, a parallelogram with four equal sides, placed on one of its points. The sides are sometimes slightly rounded and the four vertices placed in a square, making the sign look like an astroid.

Normally diamonds are red in colour. They can however be depicted in blue,[2][3] which is the case for example in bridge (where it is one of the two minor suits along with Clubs). In the official Skat tournament deck, diamonds are yellow or orange, assuming the color of their German-deck equivalent, which are usually golden.

The following gallery shows the diamonds from a 52-card deck of French playing cards. Not shown is the Knight of Diamonds used in the tarot card games:

Four-colour packs
The four aces of a four-colour deck; here, Diamonds are blue.

Four-colour packs are sometimes used in tournaments or online.[4] In such packs Diamonds may be:

  • orange in English and German packs
  • yellow in American decks and German Skat tournament packs[5] or
  • blue in English and American Poker decks,[6] French and Swiss four-colour packs.[5]

Coding

The symbol ♦ is already in the CP437 and therefore also part of Windows WGL4. In Unicode a black ♦ and a white ♢ diamond have been defined:

Symbol Unicode Entity in HTML
♦ U+2666 BLACK DIAMOND SUIT ♦ or ♦
♢ U+2662 WHITE DIAMOND SUIT ♢
gollark: Combining the O(n) time complexities of null-terminated strings with the... I don't know, nonsliceability? of length-prefixed strings and adding fun new things, length-terminated strings.
gollark: gollarC™ also features my innovative length-terminated strings.
gollark: You have to pass other ones for pointer arithmetic and such.
gollark: Actually, #2 would be hard, so "memory safety enforced via disabling pointers unless you pass a pointer aptitude test".
gollark: gollarC features:- osmarkslibc\™️ built in- memory safety enforced via disabling pointers unless you ~~provide mathematical proof that your use of them is always valid in every way~~ pass pointer aptitude tests (plus ones for pointer arithmetic etc.)- completely broken backward compatibility wrt. `switch`- lambdas for some reason- length-terminated strings- `quaternion.h`- fearless concurrency via an optional setting to deny all inter-thread shared memory access- macro for automatically generating yet another linked list implementation for some reason

References
  1. Wolfgang Pfeifer: Etymologisches Wörterbuch des Deutschen. 8. Auflage. Deutscher Taschenbuch Verlag, Munich, 2005, ISBN 3-423-32511-9.
  2. Sfetou, Nicholas. The Bridge Game.
  3. Trialling the four-colour deck at www.pokerstars.com. Retrieved 11 Jun 2018.
  4. Allan & Mackay 2007, p. 155.
  5. Gallery 3 - Sizes, Shapes and Colours at a_pollett.tripod.com. Retrieved 4 Aug 2020.
  6. Four-Color Deck at pokernews.com. Retrieved 4 August 2020.

Literature
  • Allan, Elkan and Hannah Mackay (2007). The Poker Encyclopedia. London: Portico. ISBN 978-1906-03209-8
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