The phrase "rear curtain" refers to the back part or end of something, like a stage or a vehicle. It is used to describe the area that is behind or at the back of that particular object or space. Full definition
Adaptive cruise control, front and rear curtain airbags, a driver alert system and predictive pedestrian protection are also standard. (evo.co.uk)
Feel safe with the intelligent driver and passenger front airbags, front side airbag, and front and rear curtain airbags. (larryroeschchryslerjeepdodge.com)
Inside the cabin, the special edition adds new Anniversary embroidered front seats, illuminated front scuff plates, powered rear curtain with remote and bottle holder on floor console. (motorbeam.com)