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A white pictogram on a solid blue circle, requiring an action.
Also known as: Blue circle sign, Mandatory sign, Must do sign, PPE sign, ISO 7010 M001
A white pictogram on a solid blue circle requires an action — wear eye protection, wash your hands, use the handrail. Blue is the exact opposite of the red prohibition circle, and the two are told apart by fill: blue is solid, red is an outline with a bar.
Requires the depicted action of anyone in the area — commonly wearing protective equipment, washing hands, or using a designated route.
Contexts: Public information
Is the grammatical opposite of the red prohibition circle: blue requires, red forbids. The two are distinguished by fill rather than pictogram — a mandatory sign is a solid blue disc, a prohibition sign is a red ring with a diagonal bar.
Contexts: Public information
Carries no single pictogram of its own; the blue circle is a frame filled with whichever action is required, most often a head wearing goggles, a helmet or ear defenders.
Contexts: Public information
Belongs to the mandatory-action class of safety signs, drawn as a white pictogram on a solid blue circle. A blue circle means the depicted action is required, which is the opposite of the red circle's prohibition.
Contexts: Public information
Is registered in ISO 7010 as M001, general mandatory action, and defines the mandatory family: a white pictogram on a solid blue disc, meaning something the reader must do. Blue is the mandatory colour in the same way green is safe condition and red is prohibition.
Contexts: Public information
Is what makes 'wear eye protection', 'wash your hands' and 'use the handrail' recognisable as instructions at a glance rather than as suggestions. A reader who has learnt the blue disc has learnt the whole class without learning any individual pictogram.
Contexts: Public information
A solid blue disc with a simplified white pictogram at its centre, most often a head shown from the front wearing protective equipment.
Blue circles require an action and red circles forbid one; both are circular signs and the colour carries the entire distinction.