With the design of "arrow words" framed up, I think it's time to lay this issue to rest, and just say these are all comparison operators in the default distribution.
>=and=>mean the same thing:greater-or-equal?<=and=<mean the same thing:lesser-or-equal?
What seems a little sad at the outset is that we are "wasting" =< and => on synonyms, and people from JavaScript won't be getting the familiar => as "lambda" by default. But -> is used in other languages for lambda, and it's light and clean looking. So it's probably preferable. And now there are a bunch of other arrow operators opened up.
In your own dialect or modules, you can make => and <= mean anything you want...redefine one or both. And there's no rule that >= or =< mean anything in particular either.
Case closed. 
