In some cases if not always, "fi" can be used to close an "if" clause, instead of "end if" and "od" can be used to close a "do" clause, instead of "end do".
These short forms are intuitive and can save a lot of space; for instance say you have 5 "do" clauses to be closed, it is a lot shorter to type "od:od:od:od:od:" than "end do:end do:end do:end do:end do:"
Yet for some reason it does not seem to be a recommended short form. The Advaced Programming Guide (dated 2008) does not mention it, as far as I could tell by searching for the "fi" and "od" keywords.
There is also here and there mention that it is not "recommended" or maybe even "deprecated".
I wonder why, I think it's quite beautiful.
(that was "end" backwards, a somewhat paradoxical statement)