ADOPT
Existing character that other players can 'adopt' to play. May be anything from fully named, designed, and plotted, to a blank slate with a connection to another character (kit, relative, friend, mortal enemy...) Adopts will typically either be FCFS (first come first serve: first person to say 'i want it' get the spot, while stocks last) or require APPLICATIONS.
BACKWRITE
Using fluid time to set a post before a specific thread, event, or IRL time.
BUMP
Post in a thread so it returns to the top of the front page.
FCFS
First come first serve: adopt
HP/SHP
High position/semi-high position: leaders, deputies, medicine cats, medicine cat apprentices, and council members (the guards).
IC
In-character: within the roleplay.
ONESHOT
Typically a one-post thread meant for character development or musings that doesn't expect a response.
OOC
Out of character: outside the roleplay, player speaking.
OPEN
A thread anyone can respond to.
PAFP
Public after first post: a thread that remains private until one (or more) characters have replied to it, after which it becomes open.
PRIVATE
A thread between specific characters that others aren't meant to respond to.
STORAGE
OOC thread where people post whatever they want to have on hand and in one place: their posting templates, character bios/tags, coding experiments, etc.
TAGS (or BIO)
OOC thread of a character's information, templates, etc.
RTA
Return to activity: thread posted after a character's absence from RP.