0O

0O (zero O) or 0-O may refer to: 0o, 0_o, and 0.o, a kaomoji emoticon that may refer to shock, disturbance, or confusion 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 See also O0 (disambiguation) 00 (disambiguation) OO (disambiguation)