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Signs
Flat
Logistic Delivery
warning, Broken, sign
DodgerBlue
512x512
Medical
Medical Set
Radioactivity, Biological, medical
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Elegant Themes
group, person, warning
48x48
warning, person
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Free Button
exclamation, warning, wrong
40x19
Farm-Fresh Web
Display, Alert, warning
32x32
Fugue
warning, exclamation, Error
16x16
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Mixed
Outline
Hawcons
warning
UI
Smooth
Elegant Themes Icons
group, warning, person
person, warning