HaPK wrote:
> 
> Am I missing something, but why "faculty" ? Why not factorial ?
> 

It's just a (not so much used in my experience) synonym for "factorial" 
AFAIK. Incidently (and coincidently :) ), I first saw this word used as 
a synonym of factorial a few days ago only, in the Haskell98 report. The 
little I've seen it when googling seems to indicate that its use is 
limited to programming. The term "factorial" is by far the most used.
-- 
Christophe Grandsire.

http://rainbow.conlang.free.fr

You need a straight mind to invent a twisted conlang.