Re: [Haskell-cafe] commutative monoid?

On Fri, 24 Jun 2011, Evan Laforge wrote:

So there's a range of possible Monoid instances for each type, and maybe they were chosen by historical happenstance rather than some kind of "principle monoid" (is there such a thing?). Is there a name for the thing that's like a monoid, but the operator is commutative too?

http://en.wikipedia.org/wiki/Commutative_monoid