Natural shapes which have no symetry such as rock, stones, pebbles, shape of river etc.

What does non geometric mean?

nongeometric (not comparable) Not geometric.

What is considered a geometric shape?

A geometric shape is the geometric information which remains when location, scale, orientation and reflection are removed from the description of a geometric object. ... Such shapes are called polygons and include triangles, squares, and pentagons. Other shapes may be bounded by curves such as the circle or the ellipse.