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Ternary numeral system
Ternary is the base- 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 , , and are all non-negative numbers, the adjective also lends its name to the balanced ternary system, used in comparison logic and ternary computers.
==Comparison to other radices==
Representations of integer numbers in ternary do not get uncomfortably lengthy as quickly as in binary. For example, decimal 365 corresponds to binary 101101101 (9 digits) and to ternary 111112 (6 digits). However, they are still far less compact than the corresponding representations in bases such as decimal — see below for a compact way to codify ternary using nonary and septemvigesimal.
As for rational numbers, ternary offers a convenient way to represent one third (as opposed to its cumbersome representation as an infinite string of recurring digits in decimal); but a major drawback is that, in turn, ternary does not offer a finite representation for one half (neither for one quarter, one sixth, one eighth, one tenth, etc.), because 2 is not a prime factor of the base.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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