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A yellow diamond standing on a point, warning of a hazard.
Also known as: US warning sign, MUTCD warning shape
In the United States a warning is a yellow diamond standing on one corner, not a triangle. The diamond is also used for temporary construction warnings in orange, so colour distinguishes a permanent hazard from a work zone.
Marks a warning under the MUTCD, drawn as a square standing on one corner in yellow with a black legend.
Contexts: Road signage
Changes colour rather than shape for temporary conditions, orange marking a work zone and fluorescent yellow-green marking pedestrian and school warnings.
Contexts: Road signage
A square standing on one of its corners, filled yellow with a black border and a black legend or pictogram.
The same job done by a different shape on either side of the Atlantic.