Μμ Mu was a letter in the Greek alphabet of Earth, originating in the early period of Human history.
It was used in the following contexts:
- Astronomical nomenclature
- Mu Andromedae, a star system
- Mu Aquilae, a star system
- Mu Arae, a star system
- Mu Capricorni, a star system
- Mu Cassiopeiae, a star system
- Mu Ceti, a star system
- Mu Draconis, a star system
- Mu Herculis, a star system
- Mu Leonis, a planetary system
- Mu Pegasi, a star system
- Mu Virginis, a star system
- Other