Ultrasonic speed

In aerodynamics, an ultrasonic speed is one that greatly exceeds hypersonic speeds, defined as Mach 25 and higher, five times greater than hypersonic. The term was coined by the White Wolves to properly classify the SMV Shockwave. Before this, NASA defined this range of speed as re-entry speeds.

Classification
The following table lists sonic speed classifications. Classifications marked with * are only used by NASA.