IRC term, referencing a line in the
server setup file which tells the
ircd who can be an
IRC Operator, sometimes shortened to O: (or called O-Line by people who don't know what one is).
Usage:
O:hostmask:password:name:modes:class
In cyclone at least, there's also (in no particular order) a K:Line, Q:Line, C:Line, N:Line, X:Line, A:Line, M:Line, Y:Line, I:Line, U:Line, L:Line, H:Line and a P:Line. There's also a G:Line