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A yellow triangle with a horseshoe magnet and field lines.
Also known as: Magnetic field warning, Strong magnetic field sign, MRI field warning, Yellow triangle with a magnet
The magnetic field sign marks a static field strong enough to be dangerous, and the hazard is not confined to the equipment: an MRI's field extends beyond the machine and is always on, which is why the sign marks a room boundary rather than a device.
Warns of a strong static magnetic field in the marked area.
Contexts: Public information
Marks an area rather than a device, because a strong field extends well beyond the equipment generating it.
Contexts: Public information
Signals a field that is present continuously in an MRI installation, whether or not scanning is in progress, which is why the boundary is permanently marked.
Contexts: Public information
A black horseshoe magnet with two curved field lines arcing between its poles, on a yellow equilateral triangle with a black border.