Symbol 0634 from ISO 7000 - Title/Meaning: Rear fog light Function/description: To identify the control that activates a special light (usually yellow in colour) located in the rear of the vehicle to aid with vehicle identification in foggy conditions. To indicate the operational status of the rear fog light.
Additional information: 
On road vehicles: if one symbol is used for both front and rear fog lights, the symbol for front fog light (ISO 7000-0633) shall be used.
Own work using: iso.org/obp/graphics/grs/02c694e1-6cb7-4174-a747-1d2be5680282 200.png
Vectorization:  Mrmw