A small celestial body that orbits another object other than the Sun is called a moon.

Here's why:

* Moons orbit planets: The most common type of "moon" is a natural satellite orbiting a planet. Our own Earth has one moon, while Jupiter has over 70!

* Moons orbit other celestial bodies: Moons can also orbit other celestial bodies, such as dwarf planets (like Pluto) or even other moons!

Let me know if you have more questions about moons or other celestial objects!