Any part of the contour of an Environmental Object that forms an inwardly arch-like shape.

Comments:

Concave contours tend to be weak spots (ie areas of vulnerability) on the human body and other Environmental Objects.

Concave contours, like open ended triangles, can be used to help direct and stabilize certain offensive and defensive maneuvers, while also minimizing Angles of Deflection.

See Concave Stance.

Opposite(s):

Convex

Related Definition(s):

Aim, Contour, Guide, Shape

Related Term(s):

Contour Guidance, Environmental Object