Updated: 04/26/2017 by Computer Hope

OO may refer to any of the following:

1. OO is an acronym for object-oriented.

2. Acronym for OpenOffice, also abbreviated as OOo, which is short for OpenOffice.org.

3. In chat, as another way of saying "oh," oo could also be extended to Oooo...

Chat terms, Computer acronyms