18O or ''variant'', may refer to:
*
Oxygen 18 (
18O), an isotope of oxygen with atomic mass number 18 (8 protons + 10 neutrons)
*
2019 Catalan general strike (''18-O'')
* 18º, a way to write the ordinal number
18th (eighteenth)
See also
*
δ18O
In geochemistry, paleoclimatology and paleoceanography ''δ''18O or delta-O-18 is a measure of the deviation in ratio of stable isotopes oxygen-18 (18O) and oxygen-16 (16O).
It is commonly used as a measure of the temperature of precipitation ...
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*
*
O-18 (disambiguation) and O18
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18 (disambiguation)
Eighteen or 18 may refer to:
* 18 (number)
* One of the years 18 BC, AD 18, 1918, 2018
Film, television and entertainment
* ''18'' (film), a 1993 Taiwanese experimental film based on the short story ''God's Dice''
* ''Eighteen'' (film), a 20 ...
*
O (disambiguation)
O, or o, is the fifteenth letter of the English alphabet.
O may also refer to:
Letters
* Õ• Ö…, (Unicode: U+0555, U+0585) a letter in the Armenian alphabet
* Ο ο, Omicron, (Greek), a letter in the Greek alphabet
* O (Cyrillic), a letter of ...
*
180 (disambiguation)
180 is a year.
180 may also refer to:
* 180 (number)
* ''180'' (video game), a 1986 darts video game
* ''180'' (2011 American film)
* ''180'' (2011 Indian film)
* ''180'' (album), a 2013 album by Palma Violets
* ''One Eighty'', a 1980 album by ...
(one-eight-zero; 180)
*
I80 (disambiguation) (i-eight-zero; I80)
*
l80 (disambiguation) (L-eight-zero; l80)
{{Letter–number combination disambiguation