Reghide

From xat wiki

The Reghide power removes the star, heart or cross from your pawn completely. You still have all the ordinary registered user features such as registered-only smilies. Using this power will make you appear lower down on the Visitors list.

See Topman article for more information about the ranking system.

Note: Reghide also removes the "Registered" tag in your account window (when someone hovers their cursor over your name/pawn).