These are used in my FC. I'm pretty sure peeps recognize them when they see them in chat:

Bizzy - Bismark
BST - Beast tribe quests
Bird/Berd - Company Chocobo
MB - Market Board
MATs - materials for synthesis (once confused for actual mats in the game that you use to craft on, and is now made fun of constantly, who I will keep unnamed )
Bank 1, 2, 3 - Company Chest and corresponding slot
MGS - Manderville Gold Saucer
Minis - Mini Cactpot
Jumbo - Jumbo Cactpot
Poes - Poetics
Kitty - Female Miqo'te