DuckCorp Dico

Found one definition

1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   trit
      <unit> /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)