[Haskell-beginners] Is Cons in the Haskell Module Library

Good morning, I'm going through Graham Hutton's link on Category Theory [and yes I understand that you needn't study CT in order to use Haskell] and he uses Cons. I realize that Cons may be a synonym for ':'. But can someone tell me how to search the Haskell Library to find the module containing Cons? Thank you and Merry Christmas