Working Party on Lighting and Light-signalling Equipment (cf French: Groupe de Rapporteurs sur l’Eclairage)
IWG
Informal Working Group: A group of experts authorized to develop proposals for consideration by WP.29 without being bound by formal UN rules of procedure.
LED
Light-Emitting Diode: A semiconductor device that emits light when energized by an electric current.
REESS
Rechargeable Electrical Energy Storage System: term to cover Li-ion batteries and any other devices for the storage of energy to power electrified vehicles.