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Two domains where misreading a mark has consequences. The clinical members name which health system a convention belongs to, because medical gas colours, dental numbering and inhaler colours differ between countries in ways with documented harm behind them — and because several of these markings exist only as backup for a physical safeguard, as the pin index does for cylinder colour. The accessibility members distinguish what a mark promises from what it is assumed to promise: a Changing Places toilet is not an accessible toilet, a step-free route promises only the absence of steps, and an evacuation chair without trained operators is provision in name only.
Four colours sorting casualties by urgency at an incident.
Shoulder colours identifying what is in a cylinder.
A standard set of pictograms on device packaging.
Scale lines whose interval depends on the syringe size.
A lead L or R placed in the beam before exposure.
A letter and a sign naming ABO type and rhesus status.
Three incompatible systems for naming the same tooth.
A fraction or a decimal describing how well someone sees.
Circles and crosses plotting hearing loss by ear and frequency.
A number rating how dangerous a laser is to the eye.
A number from one to four rating containment.
A rigid yellow container with a fill line and a lid lock.
A purple label with a cell in division, marking hazardous drugs.
Three symbols saying whether an item may enter the scanner room.
A rod-of-Asclepius badge worn to signal a condition.
A mark for a toilet with a hoist, a bench and space for two carers.
A mark promising a route without steps, not necessarily a level one.
A mark for a period with reduced noise and lighting.
A mark for a document written and illustrated for accessibility.
Grids of symbols used to speak without speech.
Marks naming large print, braille and audio versions.
Raised lines, textures and braille on a map to be read by hand.
A sign saying where in a building a loop actually works.
A sign for a chair used to take someone down stairs in a fire.
A protected place to wait for assisted evacuation.
Colours distinguishing reliever from preventer inhalers.
A recorded clinical decision, not a symbol worn by a patient.