Concave

The word concave means curving in or hollowed inward, as opposed to convex. The former may be used in reference to:

Concave lens, a lens with inward-curving (concave) surfaces.
Concave polygon, a polygon which is not convex.
Concave function, a type of function which is related to convex functions.
Concave mirror
Concave set
Concave football boot, a football boot company.

In addition, the term concave upwards is used for convex functions, and concave downwards for concave functions.

See also

Convex (disambiguation) — the opposite of concave.

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