Filled it out. I find this to be an interesting topic, especially since it's something i've noticed as well. Mainly how communities have developed their own slang and terminology for things or when they share some terms.

FFXI was my first MMO and the one I played longest. Almost 7 or 8 years. Afterwards I played many others. A few examples I can think of are from WoW, which I played during Mists.

In FFXI we tended to say "Hate" or enmity, while in WoW it was "Threat". In FFXI we always called jobs or characters that dealt damage "DD" for Damage Dealer. In WoW (and many others) it's DPS, which in actuality is Damage Per Second. I feel DD is more accurate.