OP stands for "One Side Plain". It means that the sheet is chequered on only on one side and the other side is plain.
Chat with our AI personalities
Yes. Op is an acceptable Scrabble word.
There's no co-op in the Single Player Campaign but there is co-op in Specials Ops.
It only has online co-op.
There should be a co-op in Halo reach because there was in Halo 3 and ODST why would they stop co-op there?
If your using a regular server, and if you are an op, just type /op (the player's name). If you aren't an op, go into the server files, open the op file, and type in your and you're friend's usernames.