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| Oxford Institute of Energy Study; Office for Interdisciplinary Earth Studies | |||
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| Osake Yhtio (Finland) | |||
| oralloy | |||
Osakeyhtiö (in Finland - a company limited by shares  wikipedia.org Eurochem) | |||
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| Osakeyhito - Finnish stock company; orange yellow | |||
| Osakeyhtiot | |||
| Option Year; Out Year | |||
| observability | |||
| Optimum Yield | |||
| Civil aircraft marking (Denmark) | |||
| optimum yield | |||