3 ms·So it saves 2 characters compared to ###y ago but requires an explanation. 2500 BP 2500y agoby mLuby 5y agoSo it saves 2 characters compared to ###y ago but requires an explanation. 2500 BP 2500y agoysavir 5y agoAgreed, I was explaining a contrast to using BC/BCE.rjknight 5y ago"ya" is an equally short abbreviation for "years ago".mLuby 5y agoI've never see that before so I'd have to look it up just like BP.