The purported Arms of the Deanery of Canterbury are "Azure, on a cross argent the monogram <a href="//commons.wikimedia.org/wiki/File:Complete_Guide_to_Heraldry_Canterbury_Monogram.png" class="image"><img alt="Complete Guide to Heraldry Canterbury Monogram.png" src="https://upload.wikimedia.org/wikipedia/commons/thumb/1/19/Complete_Guide_to_Heraldry_Canterbury_Monogram.png/15px-Complete_Guide_to_Heraldry_Canterbury_Monogram.png" decoding="async" width="15" height="20" srcset="https://upload.wikimedia.org/wikipedia/commons/thumb/1/19/Complete_Guide_to_Heraldry_Canterbury_Monogram.png/23px-Complete_Guide_to_Heraldry_Canterbury_Monogram.png 1.5x, https://upload.wikimedia.org/wikipedia/commons/thumb/1/19/Complete_Guide_to_Heraldry_Canterbury_Monogram.png/30px-Complete_Guide_to_Heraldry_Canterbury_Monogram.png 2x" data-file-width="31" data-file-height="42"></a> sable". Presumably the Dean may impale these with his personal arms.
<bdi><a href="https://en.wikipedia.org/wiki/en:Arthur_Charles_Fox-Davies" class="extiw" title="w:en:Arthur Charles Fox-Davies"><span title="British writer (1871-1928)">Arthur Charles Fox-Davies</span></a>
</bdi>
A Complete Guide to Heraldry.