(nautical) ore/oil ; designating that a ship can carry both ore and oil

Abbreviation of owned and operated.

(historical) Abbreviation of morally offensive. (film classification of the National Legion of Decency)

The ordinal number fifteenth, derived from this letter of the English alphabet, called o and written in the Latin script.

Alternative form of E

(unstressed) Contraction of of.. / (obsolete, unstressed) Contraction of on.

(nonstandard) alternative form of O (vocative particle)

Alternative form of of

Alternative form of oh

(IRC, acronym of) Operator / (acronym of) Object, see SVO