On unreal IRCd, they are extensions to the ban types.
  • ~q = quiet (~q:<banmask>)
    Users matching these bans are unable to speak, unless +v or greater.
  • ~n = nickchange (~n:<banmask>)
    Users matching these bans can't change nicks, unless +v or greater.
  • ~c = channel (~c:#badchannel)
    Users in <channel> are unable to join.
  • ~r = realname (~r:*loser*)
    Users with real names matching this are unable to join.