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A black exclamation mark in a yellow triangle.
Also known as: Warning triangle, Caution sign, Exclamation mark triangle, Hazard triangle, ISO 7010 W001
An exclamation mark in a yellow triangle is the general warning sign — the one used when a hazard has no pictogram of its own. It says a hazard is present without saying which, so it is almost always accompanied by text.
Warns that a hazard is present and care is needed, without specifying what the hazard is.
Contexts: Public information
Is the fallback of the warning family, used where a hazard has no dedicated pictogram, which is why it nearly always appears with explanatory text beneath it.
Contexts: Public information
Is distinct from the GHS exclamation mark pictogram, which is a red-bordered diamond used on chemical packaging and carries a defined set of hazard classes rather than a general caution.
Contexts: Public information
Belongs to the warning class of safety signs, drawn as a black pictogram in a yellow triangle with a black border. The triangle means a hazard is present and care is needed, not that anything is prohibited.
Contexts: Public information
Is registered in ISO 7010 as W001, general warning, and defines the family: every warning sign in the system is a black pictogram on a yellow triangle with a black border, and this one carries the exclamation mark used when no more specific pictogram exists.
Contexts: Public information
Never stands alone in good practice. Because it says only 'something here is dangerous', a supplementary panel of text is expected beneath it naming the hazard; a bare triangle on a door is a sign that has been put up without being finished.
Contexts: Public information
A thick black exclamation mark standing upright in the centre of a yellow triangle with a heavy black border, the triangle pointing up.
Both put an exclamation mark inside a bordered shape; the GHS pictogram is a red-bordered diamond on packaging, this is a yellow triangle on signage.