Types
Projectile points fall into two general types: dart/spear points, and arrow points. Larger points were used to tip spears and atlatl darts. Arrow points are smaller and lighter than dart points, and were used to tip arrows. The question of how to distinguish an arrow point from a point used on a larger projectile is non-trivial. According to some investigators, the best indication is the width of the hafting area, which is thought to correlate to the width of the shaft. An alternative approach is to distinguish arrow points by their necessarily smaller size (weight, length, thickness).
Projectile points come in an amazing variety of shapes and styles, which vary according to chronological periods, cultural identities, and intended functions.
Typological studies of projectile points have become more elaborate through the years. For instance, Gregory Perino began his categorical study of projectile point typology in the late 1950s. Collaborating with Robert Bell, he published a set of four volumes defining the known point types of that time. Perino followed this several years later with a three-volume study of "Selected Preforms, Points and Knives of the North American Indians". Another recent set of typological studies of North American projectile points has been produced by Noel Justice.
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