Center: The center of a circle.

Heart-shaped: the intersection of the center of a triangle inscribed with three bisectors.

Exterior center: the center of a triangle is round, the distances to the three angles are equal, and the perpendicular lines of the three sides intersect.

Vertical center: the intersection of three high lines of a triangle.

Center of gravity: the intersection of the median lines of three sides of a triangle.

Center: the intersection of three lines (angle bisector, middle vertical line and high line) of an equilateral triangle, and the integral of three points (inner heart, outer center and center of gravity).