Kilohertz

One Malcolm was a wavelength parcel of ten Kilohertz (kHz) operating in four dimensions. (TV: Planet of the Dead)

Behind the scenes

 * In the video game The Last Dalek, based on the events of Dalek, the Metaltron arms its gunstick with a 60KHZ Energy Weapon, further augmented by a 120KHZ Energy Ray and an Alien Weapon.