Cels Forum

OK, first off, I don't think this is off-topic, because I
need to know the correct term when describing cels....

Is the correct abbreviation OVA or OAV? I've seen people use
both.  My understanding is that it means a show only 
released on video, but what exactly do the initials stand 
for? (This would help me remember whether to use OVA or OAV)

Thanks,
Az