Molecular decay detonator
A molecular decay detonator was a type of device used in Romulan explosives. 

In 2367, Duras used a molecular decay detonator in an explosive used to disrupt the Sonchi ceremony held to verify  K'mpec's death. However, because this type of detonator was only used by the Romulans, it exposed Duras's relationship with the Romulan Star Empire. ()
Weapon components

de:Molekularzerfallszünder