The term 'Faster Than the Speed of Sound' refers to the speed of SUPERSONIC travel, which is faster than the speed of sound. SUPERSONIC travel is defined as any speed greater than the speed of sound, which is approximately 768 miles per hour. This type of travel is achieved by aircraft and other vehicles that are designed to travel at speeds greater than the speed of sound. SUPERSONIC travel has been used for military purposes since the 1950s and is now used for commercial air travel.