**0O** (zero O) or **0-O** may refer tolordll

- 0o, 0_o, and 0.o, an emoticon that may refer to shocked, disturbed, or confused. It may also represent 2 eyes looking at you, one slightly squinted, to represent an expression of examination, or "wait wut?" also written as (O)-(o), {O}-{o}, or [O]-[o] to emulate eyes peering through a pair of glasses.
- 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; see [[List of zero terms]
- Zero-order hold, model of the practical signal reconstruction done by a conventional digital-to-analog converter
- Zero-order reactions, a Rate equation for chemical reactions where rate is independent of reactant concentration on
- Zero order kinetics, a Rate equation for chemical reactions where rate is independent of reactant concentration
- Zeroth-order approximation, or 0th order; see Orders of approximation
- Zeroth-order logic, first-order logic without quantifiers

- 0o, a prefix used in some programming languages to denoteoctal (base 8) integer literals

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