There was an X# out of Cambridge labs, which was one of the two threads that evolved into Linq.
F# stands for Functional (language) #, functional languages being a special kind of language (although Python or any language capable of lambdas, hence .Net 3.0 or is it 3.5 or do I care except that it all helps Samuel create VFP.Net), can emulate functional languages).
Hank
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http://www.infoq.com/news/2007/10/FSharp-Plans>>
>>Just what the world needs! :)
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>>Why not call it Gb (G flat)? Just a musical joke. :)
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>There was talk, at one time, that F# was really fox for dot net....