Given a pair of orthologic triangles, the point where the perpendiculars from the vertices of the first to the sides of the second concur and the point where the perpendiculars from the vertices of the second to the sides of the first concur are the orthology centers of these triangles. The points are isogonal conjugates of each other.
See alsoOrthologic Triangles
This entry contributed by Rudolf Fritsch
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Fritsch, Rudolf. "Orthology Center." From MathWorld--A Wolfram Web Resource, created by Eric W. Weisstein. https://mathworld.wolfram.com/OrthologyCenter.html