Noun
mural crown (plural mural crowns)
A crown or headpiece representing city walls or towers, used as a military decoration in Ancient Rome and later as a heraldic symbol in Europe.
In May 1939, the College of Arms granted a crest (a gold lion resting a paw on a battery stamp) and supporters (two sable antelope, each with a gold mural crown around its neck and a gold star on its shoulder). Source: Internet
The old French shield and the mural crown, also in the lower section of the emblem, had a considerably greater size with respect to the present. Source: Internet