Flashlight
From Memory Alpha, the free Star Trek reference.
A flashlight was a hand-held, self-contained device used for illuminating darkened areas. It was similar to the palm beacon and SIMs beacon. (TNG: "The Game"; VOY: "Night")
In 1947, Lieutenant General Rex Denning used a flashlight to search Quark's ear for a universal translator. He was unable to find it. (DS9: "Little Green Men")
