Favorite acronyms and the like?

[FrustratedFool]

Picking a nit: a lot of the above are not acronyms, but ‘initialisms’, which are a set of letters that don’t form a pronounceable word.

We now return you to your regularly scheduled thread.

Boru

acronym, n.

1.  A group of initial letters used as an abbreviation for a name or expression, each letter or part being pronounced separately; an initialism (such as ATM, TLS).

So initialism is a sub-category of acronym.
Oh, labels.  What interesting things. They provoke such interesting discussions amongst the obsessed, lol