**The Jargon File (version 4.4.7, 29 Dec 2003):**

trit
/trit/, n.
[by analogy with bit] One base-3 digit; the amount of information conveyed
by a selection among one of three equally likely outcomes (see also bit).
Trits arise, for example, in the context of a flag that should actually
be able to assume three values ? such as yes, no, or unknown. Trits are
sometimes jokingly called 3-state bits. A trit may be semi-seriously
referred to as a bit and a half, although it is linearly equivalent to
1.5849625 bits (that is, log_2$(3) bits).
**The Free On-line Dictionary of Computing (30 December 2018):**

trit
/trit/ (By analogy with "bit") One base-3 digit; the
amount of information conveyed by a selection among one of
three equally likely outcomes. Trits arise, for example, in
the context of a flag that should actually be able to assume
*three* values - such as yes, no, or unknown. Trits are
sometimes jokingly called "3-state bits". A trit may be
semi-seriously referred to as "a bit and a half", although it
is linearly equivalent to 1.5849625 bits (that is, log2(3)
bits).
[Jargon File]
(1995-05-11)