6 icons for "certficate"

signature

signature-off

writing

writing-off

writing-sign

writing-sign-off

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Phosphor

1,512 icons MIT

Simple Icons

3,397 icons CC0 1.0

Lucide

1,668 icons ISC

Phosphor Filled

1,512 icons MIT

Feather

Heroicons

Tabler

4,985 icons MIT

Meteocons