The unary numeral system is the simplest numeral system in which each natural number is represented by a corresponding number of symbols or marks, typically ones. In unary, the number \( n \) is represented by \( n \) occurrences of a single symbol, which is usually a vertical line (|) or a dot (•).
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Represent a nonnegative integer by , using delimiters when several quantities are encoded. The length is , rather than the length of a binary numeral system representation. Despite the parent category for numerical notation, this is not a positional base-one place-value system.