From Ravenchat Wiki
Topic can refer to one of two commands.
- Topic (IRC Command) - An IRC command which lets you change the channel's topic. You must either be a half operator or above, or the channel must not be +t.
- Topic (ChanServ Command) - A ChanServ command which does the same thing. You must have the +t flag on your ChanServ access entry for this command to work.