The phrase "Trojan moon" refers to a celestial object that orbits a planet and shares the same orbit with one or more other celestial objects. Synonyms for this term include "co-orbital moon," "companion moon," and "counter-orbiting moon." These celestial bodies are interesting objects to study because they can provide insights into the history and formation of the planetary system they orbit. In particular, Trojan moons can reveal information about gravitational interactions that occurred during the early stages of the planet's formation. The discovery and study of Trojan moons is a fascinating area of research that continues to yield exciting new insights into the workings of our solar system and beyond.