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Unary may refer to:

  • Unary numeral system, the simplest numeral system to represent natural numbers
  • Unary function, a function that takes one argument; in computer science, a unary operator is a subset of unary function
  • Unary operation, a kind of mathematical operator that has only one operand
  • Unary relation, a mathematical relation that has one argument
  • Unary coding, an entropy encoding that represents a number n with n − 1 ones followed by a zero

See also[edit]