Questions about diamond (♦) moderators, their powers, and actions they have taken.
Moderators are users that have been granted additional powers to oversee a site on the SE network. They can merge questions, do mass-re-tagging, and have other fun powers. They are distinguishable by the ♦ after their names.
Copied from: http://meta.stackexchange.com/tags/moderators/info
For a list of moderators on Arqade, see this page.