Symbol 3308 from ISO 7000 - Title/Meaning: Stop operation Function/description: To instruct the operator to stop the machine or equipment as soon as possible and to switch off the engine or perform a requested action before any further operation is attempted. To indicate that one or more functions or systems on the machine or equipment are operating outside normal parameters in such a way as to require stopping the machine or equipment.
pay attention to orientation of symbolAdditional information: 
When displayed in colour, this symbol shall be displayed in red with red outer border, white inner border, red background, and white letters.
Own work using: iso.org/obp/graphics/grs/7c54ccaf-6586-48d8-9c70-7f318d2a7049 200.png
Vectorization:  Mrmw