" OP" – Overpowered used to reference a certain mechanic or tactic that's considered too powerful.
" CB" – ' Casus belli' = a justification for war, which is required in the game to declare any sort of war.
" LP" – Let's Play an alternative to the AAR, a video narrative of a game in progress with the action ongoing rather than already complete.
" AAR" – After-action report a kind of a story told about a game in progress but with the action already complete, often narrated as if the player was the actual character.
" WC" – World conquest direct conquest of every landed title.
" ERE" – Eastern Roman Empire, as alternative name for the Byzantine Empire.
" OPM" – One-province minor this acronym signifies a usually independent nation consisting of only one province.
" WAD" – Works/working as designed this acronym means that the thing in question is functioning as intended, typically used in the context of a mistaken bug.
" GG" – Gamersgate, one of the retailers of CKII.
" PI" – Paradox Interactive, the publisher of CKII.
" PDS" – Paradox Development Studio, the developers of CKII.
" CK2" or "CKII" – Crusader Kings II, the game you are on the wiki for.
These are the acronyms (initialisms) related to CK2 that you'll find on the Paradoxplaza forums: