C 19 Only users that share a channel are allowed to send messages.
i 0.0.1 User is "invisible".
o 0.0.1 User is IRC operator.
+ q 20 User is protected, can not be kicked from a channel.
r 0.0.1 User is restricted.
R (1) 19 User is registered (e.g. by NickServ).
s 0.4.0 User wants to receive server notices.
n 0.3.0 Channel doesn't allow messages of users not being members.
O 18 Only IRC operators are allowed to join this channel.
P 0.5.0 Channel is "persistent".
+ Q 20 Nobody can be kicked from the channel.
r (1) 19 Channel is "registered" (e.g. by ChanServ).
R 19 Only registered users are allowed to join this channel.
s 0.9.0 Channel is "secret".