3-glider collision

A 3-glider collision is the collision, at right angles or head-on, of three gliders. The gliders can react with each other in many different ways; as of March 2018, efforts to exhaustively enumerate 3-glider collisions are ongoing.

3-glider collisions are useful in creating larger glider syntheses, and multiple scripts exist to search through a database of them.

Also see
gollark: I mean, maybe you could actually, but that would only work for cases when it *exactly* matches some input and it might be slow.
gollark: In some cases it just memorizes things, but you can't practically test for this.
gollark: And via something something backpropagation all the inputs it's given during training move it slightly toward better functioning.
gollark: It's trained to predict the next token of text given the previous text.
gollark: To some extent, every single input it was trained on influences every output.
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