concave (disambiguation)

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
  • In addition, the term concave upwards is used for convex functions, and concave downwards for concave functions
• Concave mirror
• Concave set
• Concave football boot, a football boot company