A "curtain" is a piece of fabric or material that hangs down to cover a window or divide a space. It is typically used for privacy, blocking out light, or decorating a room. Full definition
Beginning with 2005 models, front and rear side head curtain airbags became available as options. (iihs.org)
The side curtain airbag on the driver side deployed during the crash. (iihs.org)
The bathroom was also small, with a sink - in - countertop, toilet and shower with curtain on a straight rod, all clean and in good working order. (dreamtravelonpoints.com)