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Nature
Flat
Science
Element, Flame, nature
Gold
512x512
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Signs & symbols
Glyph
Emergency signs
cross, sos, sign
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mark, emergency, sos
Code, electrocution, danger
sos, sign, radiation
509x512
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Buttons
dangerous, danger, Radioactive
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Business & finance
48x48 Free Time Icons
Explosion, Atomic, danger
48x48
Desktop apps
16x16 Free Toolbar Icons
problem, warn, danger
16x16
