Speed tape is an aluminized tape used to do minor repairs on airplanes. It looks similar to duct tape (silver gray), but its adhesive is capable of sticking on an airplane fuselage or wing at high speeds, hence the name. During the Vietnam War, helicopter rotor blades damaged by small-arms fire had a temporary repair performed by battle-damage repair crews in the field using the tape. This tape is also known as 600 mph tape.[1]
In the U.S. Air Force, it was often referred to as "thousand mile an hour" tape.
Use of speed tape should be authorized by engineering teams and comply with certain requirements. For example it can be used "with holes no larger in diameter than 2 inches and no closer to the edge of the panel than 3 inches." [2]