[Haskell-cafe] NewbieQ: colon prefix for operators, e.g., Ratio ?

[Brian Beckman]

Apologies if this is the wrong mailing list in which to pester folks with Newbie Questions, but I couldn't find my answer after half an hour of scouring the Haskell Report, the Haskell Wiki, the School of Expression book and a couple of tutorials.  The frustrating thing is that I know I saw the answer in ONE of those sources and it didn't stick at the time:
 
what does it mean when an operator is prefixed by a colon?  For instance, in the Ratio module, the meaning of 
x % y is clear, but x :% y appears in multiple places and I'm confused.  
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