The trilogarithm ,
sometimes also denoted ,
is special case of the polylogarithm for . Note that the notation for the trilogarithm is unfortunately similar to that
for the logarithmic integral .

Bailey, D. H.; Borwein, P. B.; and Plouffe, S. "On the Rapid Computation of Various Polylogarithmic Constants." Math.
Comput.66, 903-913, 1997.Lewin, L. Polylogarithms
and Associated Functions. New York: North-Holland, pp. 154-156, 1981.