Triceron
From Star Trek : Freedom's Wiki
Triceron is a type of common chemical explosive. In 2367, Duras used a triceron derivative to bomb the Sonchi ceremony aboard K'mpec's cruiser. The device was no more than three cubic millimeters in size, and was implanted into the forearm of one of Duras's accomplices. It was armed with a molecular decay detonator, which allowed it to be traced to the Romulans. (TNG: "Reunion")
