# 18O

> Mediated Wiki article. Canonical URL: https://mediated.wiki/source/18O
> Markdown URL: https://mediated.wiki/source/18O.md
> Source: https://en.wikipedia.org/wiki/18O
> Source revision: 1341212410
> License: Creative Commons Attribution-ShareAlike 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/)

**18O** or *variant*, may refer to:

- [Oxygen 18](/source/Oxygen_18) (18O), an isotope of oxygen with atomic mass number 18 (8 protons + 10 neutrons)
- [2019 Catalan general strike](/source/2019_Catalan_general_strike) (*18-O*)
- 18º, a way to write the ordinal number [18th](/source/Eighteenth_(disambiguation)) (eighteenth)

## See also

- [δ18O](/source/%CE%9418O)
- [O-18 (disambiguation)](/source/O-18_(disambiguation)) and O18
- [18 (disambiguation)](/source/18_(disambiguation))
- [O (disambiguation)](/source/O_(disambiguation))
- [180 (disambiguation)](/source/180_(disambiguation)) (one-eight-zero; 180)
- [I80 (disambiguation)](/source/I80_(disambiguation)) (i-eight-zero; I80)
- [l80 (disambiguation)](/source/L80_(disambiguation)) (L-eight-zero; l80)

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Adapted from the Wikipedia article [18O](https://en.wikipedia.org/wiki/18O) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/18O?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.