variable-speed with speed control

supersonic speed (exceeds speed of sound / Mach 1)

instantaneous vertical speed indicator / instantaneous vertical-speed indicator (IVSI)

Nr gauge (Nr = speed of rotation) / rotor speed sensor

Motor PWM speed separated from PID speed

continuously variable slope delta (CVSD)

variable

variable housing allowance (VHA)

variable-time fuse / VT fuse (VT, also fuze)

variable time (VT)

variable operating and safety level

variable safety level

constant-horsepower variable-torque output

variable charges

variable-area nozzle

variable-area plotting

variable-area record section

variable-area recording (VAR)

variable-displacement pump

variable-lift cam

variable-sweep wing

infinitely variable

variable restrictor

variable sweep delta wing

variable sweep wing

variable-area propelling nozzle

variable-delivery piston pump

variable geometry (VG)

variable dihedral airplane

fundamental equation of flow through the conduit of variable cross-section area

variable motion of fluid

variable orbit

variable speech terminal