You searched for CHANNEL LEVEL
1. channel level
Syntax: @ level <channel name> <level>
Channel owners are able to set a level on their channel so that only players
who are that level or higher may view what is said on the channel and chat
on it. If the owner sets sets the level higher than him or herself, he will
still be able to use the channel. Players who have been given unlimited
access to a channel will still be able to see messages on the channel and
chat on it even if they do not meet the level requirement.