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- Oceanic – Macintosh IIsi
- Oktoberfest - iPhone OS 1.1.2
- Omega – PowerBook 190
- Omega – PowerBook 190cs
- Omega – Power Mac G5
- Onyx – PowerBook G4 (Gigabit Ethernet)
- Optimus – Macintosh LC 575
Read more about this topic: List Of Apple Codenames
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Read more about this topic: List Of Apple Codenames