Definition: In physics and mathematics, an arrowhead is a feature of a curve that describes how it bends at its endpoint. Arrowheads are typically used in the context of curves to indicate where they bend or turn, as well as for visualizing the curvature of a curve. For example, consider a parabola, which has an arrowhead at its vertex (the point of tangency between the directrix and the axis). This shape can be represented by drawing a straight line with a slope that is