The orthojoin of a point 
is defined as the orthopole of the corresponding trilinear
line 
. In other words,
the orthojoin of Kimberling center 
is equivalent to the orthopole
of the line 
.
It is also the orthopole of the trilinear polar of the isogonal conjugate of 
.
The following table summarizes the orthojoins of various Kimberling centers.
