Suppression collar
The suppression collar was a device designed to prevent an individual from exercising their psionic abilities, inhibiting telepathy or psychokinesis. According to Quark, most telepathic suppressors were fairly bulky devices.

Eris, a Dominion spy, was supposedly fitted with a telekinetic suppression collar after her "capture" by the Jem'Hadar. In reality, this collar was little more than a collar with a complex locking device. ()
 

Memory Alpha articles named from scripts
Fictional technology