Projectile point

In archaeology, a projectile point is an object that was hafted and used either as knife or projectile tip or both, commonly called an arrowhead. Occasionally, projectile points made of worked bone or ivory are found at archaeological sites, but generally the term is reserved for a refined chipped-stone biface. Projectile points fall into two general types: dart points and arrow points. Dart points are defined as those bifaces which were used to tip spears and atlatl darts. Arrow points are smaller and lighter than dart points, and were used to tip arrows. In North American archaeology dart and arrow points come in an amazing variety of shapes and styles, which vary according to time and geographic area. The question of how to distiguish a arrowpoint from a point used on a larger weapon is non-trivial; the best indication is the width of the hafting area, which will correlate to the width of the shaft (Wyckoff 1964).
See more at Wikipedia.org...