I line in an IRC Server's configuration which describes nicknames which are "quarantined" - that is to say, they are not allowed to be used, for example, SlashNET has Q:Lined *Serv* to stop people pretending to be IRC Services.

Format:
Q:*:comment:mask

In cyclone at least, there's also (in no particular order) a K:Line, O: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

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