The tone arm is the device on a disc machine which holds the reproducer and connects it to the horn. The tone arm generally pivots so as to move the reproducer from the outside of the disk to the inside. Many tone arms have a curvature in them so as to help keep the reproducer at a 90' angle to the record center for optimum reproduction.

The pivoting support arm located at the rear of the turntable base used to hold the cartridge and stylus during record playback.

mechanical device consisting of a light balanced arm that carries the cartridge