The Perspector of the Inscribed Parabola
Draw lines from the vertices of the triangle to the point of tangency of the parabola on the opposite side.
These three lines are concurrent at the perspector P of the inscribed parabola. This point is on the
Steiner circumellipse. The line through the focus F and the perspector P intersect the Steiner circumellipse
at the Steiner point S.