backboard

Short definition from Wiktionary

Noun

1. 1
   The flat vertical surface to which the basket is attached.
2. 2
   A flat vertical wall with the image of a tennis net drawn or painted on it, designed to practice hitting against such that the ball rebounds.
3. 3
   A spine board.
4. 4
   A board placed at the back of a cart, boat, behind a signal, etc.
5. 5
   The port or larboard side of a ship

Verb

1. 1
   To place (a patient) on a spine board.