210.12 Arc-Fault Circuit-Interrupter Protection.
(B) Dwelling Unit Bedrooms. All branch circuits that supply 125-volt, single-phase, 15- and 20-ampere outlets installed in dwelling unit bedrooms shall be protected by an arc-fault circuit interrupter listed to provide protection of the entire branch circuit.
Outlet. A point on the wiring system at which current is taken to supply utilization equipment.
An example is a lighting outlet, a receptacle outlet, smoke detector outlet, 15 or 20 A, 125 V AC outlet, etc.