ghost/admin/public/assets/icons/undo.svg
<svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24">
<title>undo</title>
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<path stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="1.5" d="M11.167 22.968c.274.02.555.032.833.032 2.652 0 5.196-.993 7.071-2.762C20.946 18.47 22 16.072 22 13.572c0-2.501-1.054-4.9-2.929-6.668C17.196 5.136 14.652 4.143 12 4.143H9.5"/>
</svg>