FO
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FO can mean:
- Faroe Islands (ISO country code)
- Faroese language (ISO 639 alpha-2)
- Frag.Ops (UT2004 MOD)
- The Furka-Oberalp-Bahn, a railroad operating in the Swiss Alps.
- XSL-FO, or XSL Formatting Objects
- Forward Observer, in military terms, a soldier who directs and adjusts artillery fire in the field.