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Signs & symbols
Glyph
Alchemy
minimal, Alchemy, protect
Black
512x512
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Miscellany Web icons
padlock, security, protect
371x512
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Buttons
security, protect, warning
Goldenrod
help, Protection, security
Teal
Block, protect, shield
OliveDrab
protect, shield, ok
Block, ban, Adware
Firebrick