If a line 
is the Simson line of a point 
on the circumcircle of a
triangle, then 
is called the pole of 
(Honsberger 1995, p. 128).
Simson Line Pole
See also
Simson LineExplore with Wolfram|Alpha
References
Gallatly, W. The Modern Geometry of the Triangle, 2nd ed. London: Hodgson, p. 24, 1913.Honsberger, R. Episodes in Nineteenth and Twentieth Century Euclidean Geometry. Washington, DC: Math. Assoc. Amer., p. 128, 1995.Referenced on Wolfram|Alpha
Simson Line PoleCite this as:
Weisstein, Eric W. "Simson Line Pole." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/SimsonLinePole.html