Unary

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