Bearers of the Dark Mark

Lord Vodemort's followers,the Death Eaters are each branded with the Dark Mark. The Mark is used to summon the Death Eaters when Voldemort presses his wand on the Mark.It is possible this is a Protean Charm.

List of Bearers of the Dark Mark
Bellatrix Lestrange Barty Crouch Jr. Peter Pettigrew Severus Snape Lucius Malfoy Draco Malfoy Rodolophus Lestrange Rabastan Lestrange

This list is incomplete.