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            <b><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Adding icon for digital signature"
   href="https://bugs.documentfoundation.org/show_bug.cgi?id=108294#c4">Comment # 4</a>
              on <a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Adding icon for digital signature"
   href="https://bugs.documentfoundation.org/show_bug.cgi?id=108294">bug 108294</a>
              from <span class="vcard"><a class="email" href="mailto:tietze.heiko@gmail.com" title="Heiko Tietze <tietze.heiko@gmail.com>"> <span class="fn">Heiko Tietze</span></a>
</span></b>
        <pre>* Checkmark (one of the designer's pets like arrows)
* Pencil (+1 from my side)
* Stamp (difficult as it easily could be used for different things)
* Fingerprint (nice but maybe doesn't scale well down to 16px)
* Barcode (don't get it)

Other metaphors: 
* Handwriting (some written/scribbled letter)
* Closed lock (similar as the stamp)
* Shield

And everything has been done before...
<a href="https://thenounproject.com/search/?q=signature">https://thenounproject.com/search/?q=signature</a></pre>
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