(Karate Kick) Knee Strike. (Feet) Knee kick.

Hiza Geri is the Japanese word for knee strike or more literally knee (hiza) kick (geri).

A knee strike is often used for close-in fighting where a martial artist can not fully extend their legs (i.e. unable to launch a roundhouse kick due to the close proximity of the opponent), grappling situations where arms are trapped or restricted, etc. Targets for knee strikes include an opponent’s ribs, thighs, chin/face (if the head is pulled down during grappling), etc.