Other
- Megaupload, a one-click filehosting service
- MisUnderstood word, a term in Scientology
- MU puzzle, a puzzle in Gödel, Escher, Bach
- Mothers' Union, global Anglican women's organisation
- µTorrent, a freeware BitTorrent client for Microsoft Windows and Mac OS X
- Musician (MU), an enlisted rating in the United States Navy
- Daikon, a mild, large, white, East Asian radish (Korean word)
- A gusset in the traditional Korean dress of hanbok
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