Quantum singularity

A quantum singularity (also known as a black hole) is a massive object in space that is formed by the collapse of a star. They are also formed by a supernova whose gravitational field that is so strong that no electromagnetic field can escape. People in the Federation sometimes refer to them as Hawking black holes after the 20th century Earth scientist, Professor Stephen Hawking. (TOS novel: The Entropy Effect).

During the 24th century, the Romulan Star Empire used artificial quantum singularities to power the warp cores of their starships, including the massive D'Deridex-class warbirds. (TNG episode: "Timescape").