ISO 21482
ISO 21482
Technical standard for radiation warning symbols.
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Readers' pathsAug 2026 – Oct 2026
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Hazard symbol
Warning symbol on locations or products.
41%
Goiânia accident
1987 radioactive contamination incident in Brazil.
10%
Radioactive source
Radionuclide emitting ionizing radiation.
10%
Trefoil
Artistic representation of three circular leaf shapes used in architecture.
5.1%
International Organization for Standardization
International standards development organization.
3.3%
Radioactive decay
Emissions from unstable atomic nuclei.
2.8%
ISO 3864
Technical standard for safety symbols.
2.2%
Pantone
American company known for its color system.
1.7%
Skull and crossbones
Warning sign.
1.2%
International Atomic Energy Agency
International organisation.
0.56%
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