OO
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- In model railroading, OO scale is a 1:76.2 modelling scale,
- In computer science, OO stands for Object-oriented programming.
- In National Forensics League, OO stands for Original Oratory.
- In type and chat conversations, oo stands for over and out
- An abbreviation for OpenOffice.org, which is commonly (and incorrectly) known as "Open Office".
- the IATA code for SkyWest
- Oo, oO, OO emoticons