an anchor symbol, fit for U+2693
<a href="//commons.wikimedia.org/wiki/User:Egg" title="User:Egg">egg</a> extracted the symbol out of the coat of arms
<a href="//commons.wikimedia.org/wiki/File:Norrt%C3%A4ljes_vapen.svg" title="File:Norrtäljes vapen.svg">Image:Norrtäljes vapen.svg</a>