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Signs
Flat
Factory
Alert, warning, exclamation
Gray
512x512
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Medical
Poisonous, Healthcare And Medical, danger
Chocolate
Black
medical, Dead, skull
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Web
danger, signs, Shapes And Symbols
Biochemistry
education, Biohazard, Toxic
Laboratory set
miscellaneous, Biohazard, Toxic
danger, dangerous, signs
Lab elements
Weapons
Bomb, explosive, miscellaneous
DarkSlateGray
danger, hazard, signs
Goldenrod
Education
Science
hazard, Signaling, education
Nature
Burning, danger, education
Signaling
Biohazard, Toxic, danger
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Toxic, danger, hazard
Flame, nature, Burning
danger, hazard, Signaling
education, signs, Signaling