What is ACV?

[at-home]

I should know this by now.....what is ACV? Also, is there a place on this forum (or in forums generally) that has a key to abbreviations? I don't know what people are saying half the time because of all the abbreviations.
Thank you.

[Taedareth]

Apple cider vinegar. If there isn't a sticky with translations of our shorthand, there ought to be