The earliest appearance of the term "isoconjugate" in triangle geometry may have been by Kimberling as early as 1998. Isoconjugates were also discussed in
Kimberling (2001, 2002). Thereafter, the term "isoconjugate" has sometimes
been used to mean reciprocal conjugate,
which is a different sort of conjugate (Kimberling).
and 
be points in trilinear coordinates, neither
of which is on a side line of a reference triangle 
. Them the 
-isoconjugate of 
is the point
