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Ternary numeral system
A ternary numeral system (also called base 3 or trinary) has three as its base. Although ternary most often refers to a system in which the three digits are all non-negative numbers (specifically 0, 1, and 2), the adjective also lends its name to the balanced ternary system. Comprising the digits −1, 0 and +1, balanced ternary is widely used in comparison logic and ternary computers.