sun visor

US /ˈsʌn ˌvaɪ.zər/
UK /ˈsʌn ˌvaɪ.zər/
"sun visor" picture
1.

a movable flap on the inside of a vehicle's windshield that can be lowered to block sunlight

:
She pulled down the sun visor to shield her eyes from the glare.
The car's sun visor also has a small mirror.
2.

a cap with a peak but no crown, worn to shade the eyes from the sun

:
He wore a sun visor while playing tennis.
The golfer adjusted her sun visor before taking her shot.