Hazard & Warning Symbols

Radioactive, biohazard, high-voltage, and warning signs plus the alert marks that go with them. Click any symbol to copy it instantly.

Hazard symbols flag danger at a glance. This library gathers the radioactive, biohazard, and skull-and-crossbones marks, the warning and caution signs, the electrical and high-voltage glyphs, and the exclamation marks used for alerts — every one a plain Unicode character you can copy into labels, docs, and messages.

Toxic

Toxic, Radioactive & Biohazard

The classic danger signs for radiation, biological hazards, and poison.

Radioactive Sign
Biohazard Sign
Skull and Crossbones
Coffin
Funeral Urn
Warning

Warning, Caution & Electrical

General warning marks and the high-voltage and electrical hazard signs.

Warning Sign
Caution Sign
High Voltage Sign
Lightning
Electric Arrow
Alerts

Alert & Exclamation Marks

Exclamation and cross marks used to draw attention to a danger or error.

Double Exclamation Mark
Exclamation Question Mark
Heavy Exclamation Mark Symbol
White Exclamation Mark Ornament
Cross Mark
No Entry
No Sign & Prohibition

Prohibition & No-Entry Signs

Copy the no sign (prohibited) symbol and related prohibition and no-entry markers for warnings and notices.

No Entry Sign (Prohibited)
Empty Set
Slashed O
No Smoking
No Pedestrians
No Mobile Phones
No One Under 18

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Related Resources

Traffic & Road Sign Symbols

Road, traffic, and transit signs to copy and paste.

Recycle & Environment Symbols

Recycling, eco, and environmental marks in Unicode.

Special Characters

Unique Unicode symbols with individual meaning and standalone appeal.

Biohazard Symbol

The trefoil-and-circles sign (☣) engineered in a 1966 Dow Chemical lab to be instantly memorable and completely meaningless on its own.

Stop Sign Symbol

🛑 U+1F6D1.

Skull and Crossbones (☠)

The skull and crossbones (☠) that marks poison and flies on the Jolly Roger.