A trit is the trinary analog of the Bit: Where a bit says 2, a trit says 3. “Trit,” like “bit,” is overloaded:
A trit of data (analog of a bit of data) is the amount of data that can be carried by a physical object that can be placed in any one of three states.
A trit of information (analog of a \(\log_2(3)\approx 1.58\) bits of information.) is the amount of information someone receives when they start out maximally uncertain about which one of three outcomes happened, and then they learn which one happened. A trit of information is
A trit of evidence (analog of a) in favor of a hypothesis is an observation that is three times as likely if the hypothesis is true (versus if the hypothesis is false).
“Trit” is a portmanteau of “trinary digit.”