Symbol 3645 from ISO 7000 - Title/Meaning: Trailer coupling ball Function/description: To identify the control for deploying or retracting the coupling ball into the position. To indicate deployed or retracted status of the coupling ball and malfunction of positioning mechanism
pay attention to orientation of symbolAdditional information: 
The symbol may be modified in order to better represent the true trailer coupling shape 2) Other symbols may be added, e.g. arrows to indicate direction of swiveling or lock/unlock symbols to indicate locked/unlocked status
Own work using: iso.org/obp/graphics/grs/92d3a77c-f49b-4e2a-8f1f-3315c1e33fb8 200.png
Vectorization:  Mrmw