"Warning" triangle icon design based upon ISO 7010:2019, for the following situation:
Hazard
Pressure hazard causing injury; contents under pressure that can cause injury or death; explosion; steam; burst hazard; compressed air hazards; pressure vessel hazards; tank hazards.

Human behaviour that is intended to be caused after understanding the safety sign's meaning
Avoidance of pressurized release that can cause injury or death

Additional information
This sign is not (as of 2021) part of the ISO 7010 icon set, but is commonly commercially available in various renderings, and with slightly different shapes for the 'person' and the 'steam'.
Test data obtained according to ISO 9186-1 are not available. Consequently, a supplementary text sign shall be used to increase comprehension except when the safety sign is supplemented by manuals, instructions or training.
Compare with ISO 7010 W002.

Background shape similar to basic shape recommended in ISO 7010 W000.
Own work
Author