Agonizer
An agonizer was a small device worn on the belts of Imperial personnel in the mirror universe, used to inflict pain for minor transgressions. More severe offenses called for using the agony booth. ()

In the prime universe, the Klingons also used a similar device in 2268. () 

In 2370, Arctus Baran used neural servos, which were implanted in each member of his crew, as a means of maintaining obedience through coercive menace. ()

In 2372, the mirror universe counterparts of  and  were subjected to these devices by their captors to make them more obedient. ()

See also 
 Collar of obedience 
 Pain band
 Painstik

Apocrypha 
In the Star Trek: Mirror Universe story "Ill Winds" from the Shards and Shadows anthology, Sarah April's mirror universe  is said to have developed the agonizer. 

In , agonizers were seen as still being used in the mirror universe. They were sufficiently improved over the earlier model that they no longer needed physical contact with their victims to be effective.

In the TNG-era novel Dark Mirror by Diane Duane, a 24th century Empire had incorporated the agonizer into the  insignia pins worn on the uniform, much as in the primary universe, Starfleet had incorporated communicators. As with those seen in "Shattered Mirror" they were improved technologically, but it was so they could be smaller, and they still needed to touch their victims to work.

Klingon agonizers were also seen in use in the Star Trek newspaper comic strip.

External links 
 
 

de:Agonie-Simulator
mu:Agonizer
Mirror universe
Weapons