RO
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RO or ro may stand for:
- Ro: an artificial language created by Edward Powell Foster
- Ro (pharaoh): the early pharaoh
- Romania (ISO 3166-1 alpha-2 country code, RO)
- Romanian language (ISO 639 alpha-2, ro)
- Ragnarok Online, an MMORPG
- Reverse Osmosis
- Receive only, a type of teleprinter that contains neither a keyboard nor punched tape equipment
- Royal Ordnance, a subisidiary of BAE Systems, known as RO Defence. Merged with Alvis Vickers to form BAE Systems Land Systems.
- the IATA code for Tarom, the national airline of Romania
- Red Orchestra, The WW2 Russian spy network, also a title of a modification for Unreal Tournament 2004
Ro may also refer to: