Other Uses
- Gm (digraph)
- RGM-79 GM, a mobile suit series in Mobile Suit Gundam
- Grandmaster (chess), awarded to strong chess players by the world chess organization FIDE
- General MIDI, a standardized specification for music synthesizers
- George Medal, UK civil decoration for acts of great bravery
- Gunner's mate, a rank of the U.S. Navy
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