A backboard is a piece of basketball equipment. It is a raised vertical board with an attached basket consisting of a net suspended from a hoop. It is made of a flat, rigid piece of, often Plexiglas or tempered glass which also has the properties of safety glass when accidentally shattered.

What is a Bakeboard?

: a board on which dough is kneaded or rolled.

What does it mean to backboard someone?

: a stiff board on which an injured person and especially one with neck or spinal injuries is placed and immobilized in order to prevent further injury during transport. More from Merriam-Webster on backboard.