[xnx]

GO4?

[merrywhether]

“Gang of Four”, the name commonly applied to the authors of the seminal book “Design Patterns”

https://en.m.wikipedia.org/wiki/Design_Patterns

[0x500x79]

Gang of Four. https://en.wikipedia.org/wiki/Design_Patterns

[p4bl0]

Not sure but I suspect it would be the "gang of four", i.e., the authors of the canonical OO design pattern book.

[jeffshek]

Gang of 4 - 4 authors from the book