OM
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OM or om may stand for:
- Observer Magazine, a supplement of the British Observer newspaper
- Odyssey of the Mind, an international problem-solving competition
- Olympique de Marseille, a prominent French football team
- Om, the most sacred syllable in Hinduism
- OM (Officine Meccaniche), which was an Italian truck manufacturer
- Oman, which has the country code OM
- OM HEX, which is a Swedish company that owns several Stock Exchanges in Northern Europe
- Order of Merit membership post-nominal letters in the British honours system
- Old Mana common term used by Ham Radio operators referring to someone whose name is not known. Origins in early telegraphy.