An M:Line is a line in an ircd configuration file giving information about the IRC Server -

Format:
M:server address:ip:description:port

In cyclone at least, there's also (in no particular order) a K:Line, Q:Line, C:Line, N:Line, X:Line, A:Line, O:Line, Y:Line, I:Line, U:Line, L:Line, H:Line and a P:Line. There's also a G:Line

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