ACL AOP
Users on the AOP access list will be set CMODE +o (op) when joining the channel. They can change most channel modes (if not locked), PROPs and kick and ban users from the channel.
AOPs have quite a bit of power in a channel and adding users to this list should be done with care, as the power can be abused and cause a lot of trouble for the channel and its users. Unlike a temporary channel op, AOPs can op themselves if you deop them, or invite themselves back into the channel if you try to ban them.
A channel also shouldn't have too many ops, because it is harder to keep control on everything in a channel if many users are able to change modes and do so regularly.