This is not a trivial question.

The morphology of a weapon — its shape, its proportions, the specific way it tapers to a tip, the angle of its working edge — tells you things about how it was made and how it was used.

A projectile point designed to be thrown with an atlatl has different proportions and different tip geometry than a point designed to be used on a thrusting lance.

The specific form of the tip tells you something about the manufacturing tradition from which it came — the specific technical knowledge that the maker possessed and applied.