post #2846229 post #4660411 post #3735580
A hazard pictogram is a pictogram that uses high contrast, a limited color palette, and highly legible text to communicate a warning or identification to onlookers. White-black or yellow-black are common color choices due to providing great contrasts.
The Globally Harmonized System of Classification and Labelling of Chemicals ("GHS") includes an internationally-recognized standard for labeling of hazards and hazardous materials, and the monster fucker sign spawned a small number of imitators making similar interspecies pictogram art.

Counterexamples

post #1640702 The fire depicted here is not a hazard pictogram, as it lacks high contrast or a limited color palette, and is not communicating a literal fire.

post #540957 The sign depicted here has no pictogram element whatsoever.