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Mixed
Filled outline
Line color mix Vol.1
Megafone, Loud, megaphone
Black
512x512
Line color mix Vol.2
Attention, Megafone, Alert
Network & communications
Line color mix Vol.3
Attention, Megafone, Broadcast
CadetBlue
Music & multimedia
Outline
Line mix Vol.1
Alert, Megafone, megafon
Mayssam
Error, Alert, danger
Signs & symbols
Flat
Circle Icons
Attention, danger, Caution
IndianRed
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Office Vol.2
Loud, Alert, megafon
MediumTurquoise
Office Vol.3
speaker, Broadcast, Alert
DimGray
Business & finance
Office Vol.4
Alert, Loud, megafon
MediumAquamarine
Healthcare & medical
Firefighter
no smoking, smoke alarm, fire alarm
LightBlue
Twitter UI Set
Alert, notification, ring
UI
ikooni outline: Free Basic
Caution, Error, danger
Error, Caution, Alert
Linecon
Alert, Alarm, Clock
Krispicons- Modern Flat Icons Freebie
timer, Horn, Alert
Purple
111x111
Firebrick
Handdrawn
Social Messaging & Productivity
danger, Attention, Error
Fire
bell, danger, problem
Crimson
ForAll
warining, Alert, Error
LightSeaGreen
Glyph
Very Basic. Android L (Lollipop)
problem, Attention, warning
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Files & folders
AwesomeFolders
Folder, Check, exclamation
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Computer & hardware
Mirrored Twins (hollow)
sign, Caution, warning
Desktop apps
Minicons
Alert, Prompt, Attention
Confirmation, Box, Alert