o

o noun
or O /ˈoʊ/
plural o's or os or O's or Os /ˈoʊz/
o
noun
or O /ˈoʊ/
plural o's or os or O's or Os /ˈoʊz/
Britannica Dictionary definition of O
1 
: the 15th letter of the English alphabet
[count]
[noncount]
2 
[count] : the number zero — used in speech when referring to numbers
3 
[count] — used as a mark at the end of a letter, an e-mail, etc., to represent a hug