Oblique shock wave

A shock wave that forms on a sharp-pointed object moving through air at a speed greater than the speed of sound. Air passing through an oblique shock wave is slowed down, but not to a subsonic speed, and its static pressure is increased.

Aviation Maintenance Technician Handbook — Airframe, p. G-24

Also defined in 1 more source

A pressure wave that forms on a sharp-pointed object when air flows past it at a supersonic speed.

Aviation Maintenance Technician Handbook — Powerplant, p. G-19