That stands for radioactive, which also translates to get the f*** away and don't touch whatever that's near. It can be on anything that gives off dangerous levels of radioactive waves, such as an X-ray. It is a warning to not go near unless you're authorized to do so and have the proper equipment
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The Radioactive Trefoil sign indicates radioactivity or radioactive materials:
That stands for radioactive, which also translates to get the f*** away and don't touch whatever that's near. It can be on anything that gives off dangerous levels of radioactive waves, such as an X-ray. It is a warning to not go near unless you're authorized to do so and have the proper equipment