Symbol 6299 from IEC 60417 - Title/Meaning: Hexagon Function/description: [To indicate the status of danger for safety of persons or environment, to indicate the status of emergency for condition of process, and to indicate the status of faulty for state of equipment.;Only the shape for safety-related applications shall be bold-rimmed.]
Additional information: 
This basic symbol is used for the following applications depending on context:;visual danger signal (meaning visual signal indicating imminent onset or actual occurrence of a dangerous situation, involving risk of personal injury or equipment disaster, and requiring some human response to eliminate or control the danger or requiring other immediate action);visual warning signal (meaning visual signal indicating the imminent onset of a dangerous situation requiring appropriate measure for the elimination or control of the danger) ;visual emergency signal (meaning visual signal indicating the beginning or the actual occurrence of a dangerous situation requiring immediate action)
For frequencies of flashing visual characteristics and acoustic codes, see IEC 60073
Own work using: iso.org/obp/graphics/grs/0465a72f-e0d3-4842-a2f4-fa27e20496bc 200.png
Vectorization:  Mrmw