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does the R language have an executable also called R?

I think the reason is that this is close to home to Ramda users - the typical name for the Ramda object in Javascript is R.

(for the unaware, Ramda is basically Underscore but more powerful and with a saner, more consistent API)

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Yes, it does. Even if it didn't, it's still confusing I'd say. Why not just call it ramda? Still quite short. Actually, R is the only single letter executable that I can think of. Chances of clashes are ~1/26 :)

From the js perspective you use it all over the place so it's nice to have a one letter name:

var my_sort = R.compose(R.first, R.sort, R.prop('id'))

R in Linux (OS X is case insensitive, why!) is the command to call R. Usually R is written in an IDE and executed in the IDE or in scripts calling on R.

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