salute / snap point / finger guns / got it! / OK! / thumbs up / hat tip / peace sign / etc.
(thumbs up?)
I think this is a salute?
would this also count?
just edited in OK and thumbs up to the title! you guys are FAST
(sarcastic)
couple of awkward-ish ones 
/adds hat tip and peace sign to the top! these all seem appropriate category buddies
, arguably
