The Archotek Project Wiki:Chat Moderator

Chat moderators are users who have chat moderator status in chat to moderate a community's chat room. They can block users from chat, which will kick a user out of the chat and ban them from returning until a chat moderator or an admin unbans them from the users' contributions page, or if the ban expires.

Having this status causes "CHAT MODERATOR" to appear next to the username on the user's userpage.