The enclosed mobile chair that sustains Fleet Captain Christopher Pike after his accident, operated by his brain waves and able to signal only yes or no with a flashing light.
After exposure to delta radiation while rescuing cadets from a training ship, Pike is left paralysed and unable to speak. The chair encloses his body, keeps him alive and moves at his mental command. A light on the front flashes once for yes and twice for no.
It is seen in the original series two-parter The Menagerie, in which Spock abducts his former captain and takes him to Talos IV, where the Talosians can give him the illusion of health.
The chair looms over later series. In the Discovery episode Through the Valley of Shadows, Pike takes a time crystal on Boreth and sees a vision of himself in it, and Strange New Worlds returns to that image as he comes to terms with a fate he knows in advance.