Oh my goodness I love them! Each card has a different programming language that basically describes the card itself.

For example, here's the code for the 8 of clubs (it's in C#):

static void PrintCard() { Card aCard = new Card(8, "Clubs"); Console.WriteLine("{0} of {1}", aCard.no, aCard.Suit); }

They do include the typical Python and Java and two C offspring, but I think where this deck shines is in the more obscure references. For example, check out the 2 (it's Assembly) and the 5 (it's Brainfuck!) in the images.

If anyone is interested in getting one, head on over to Varianto 25

EDIT: did I mention that the build quality is GREAT on these things!