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Signs & symbols
Glyph
Web UI
Safe, Circle, privacy
Black
512x512
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Miscellany Web icons
Antivirus, shield, security
384x512
Protection, security, Key
434x512
padlock, security, protect
371x512
Mixed
Basic icon element
security, Lock, protect
Free Misc Icon Set 2
security, safety, on
iconnice vector icon
security, Safe, Protection
445x512
Amenities - Solid
payment, security, credit
Lock, security, secure
security, payment, Protection
iOS7 optimized
Miu
safety, stroke, Protection
private, Protection, safety
locked, protect, security
security, secure, protect
Social Messaging & Productivity Mix Icons
handrawn, files, documents
Avatars & smileys
Users. Android L (Lollipop)
secure, security, police
UI
Google Material Design icons
security
Social media
Pix Glyph Set - free
banking, payment, mastercard
Travel & hotels
Meanicons
security, Camera, meanicons
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Business & finance
Devine Icons Part 2
128x128
Desktop apps
Ourea Icons
256x256
Flat UI Icons Free
Unlock, password, secure
Picol Vector
security, document, Text
security, Server