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The ternary numeral system (also called base-3) has three as its base. Analogous to a bit, a ternary digit is a trit (trinary digit). One trit is equivalent to log23 (about 1.58496) bits of information.
Quaternary is the base-4 numeral system. It uses the digits 0, 1, 2 and 3 to represent any real number.