Also, although XFCE could stand for X Free Cholesterol Environment, it's easier to find X Cholesterol Free Environment, that is, XcFe
Something interesting is that nowhere at
www.xfce.org the acronym meaning is told. Neither is at their links pages.
This is written at debian package site, under xfce page:
"[...] The Cholesterol Free Environment, previously called XForms Cool Environment [...]"
Maybe there's not an official acronym, everything started as XForms Cool Environment and then, after nomore using XForms, the acronym didn't have sense at all, everyone could call it as wanted.
I prefer XForms Cool Environment, since the cholesterol thing seems to be somewhat offensive and not serious.