Arnet's "Euler's Line"

Euler’s Line: Line which passes through the Orthocenter, Centroid and Circumcenter

Orthocenter – The point where the perpendicular lines (which passes through a corner of the shape) of each side meet

Centroid – The point where the lines originating from the middle of each side meet

Circumcenter – The point where the perpendicular bisectors of each side meet.