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Wikipedia definition
1. Ternary numeral systemTernary (sometimes called trinary) is the base-3 numeral system. Analogous to a bit, a ternary digit is a trit (trinary digit). One trit contains (about 1.58496) bits of information. Although ternary most often refers to a system in which the three digits 0, 1, and 2 are all whole numbers, the adjective also lends its name to the balanced ternary system, used in comparison logic and ternary computers.
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