Billboards in the context of Arrow (symbol)

An arrow is a graphical symbol, such as ←, ↑ or →, or a pictogram, used to point or indicate direction. In its simplest form, an arrow is a triangle, chevron, or concave kite, usuallyaffixed to a line segment or rectangle, and in more complex forms a representation of an actual arrow (e.g., ➵ U+27B5). The direction indicated by an arrow is the one along the length of the line or rectangle toward the single pointed end.