0O

0O (zero O) or 0-O may refer to:


 * 0o, 0_o, and 0.o, a kaomoji emoticon that may refer to shocked, disturbed, or confused.
 * 0-O, abbreviation for 0-operand instruction set
 * 0o, or zero object, a mathematics term for a simultaneously initial and terminal object
 * 0O, also ZO, an abbreviation for zero order
 * Zero-order hold, model of the practical signal reconstruction done by a conventional digital-to-analog converter
 * Zero order process (chemistry), a chemical reaction in which the rate of change of concentration is independent of the concentrations
 * Zeroth-order logic, first-order logic without quantifiers
 * Zero-order process (statistics), a sequence of random variables, each independent of the previous ones
 * Zeroth-order approximation, an approximation of a function by a constant
 * 0o, a prefix used in some programming languages to denote octal (base 8) integer literals