<svg/charges/architecture> OR <svg/charges/emblem>. Architecture is more intuitive, but the symbol is more considered a symbol of Pennsylvania than an architectural element. I don't know which one I'd categorize it as to be honest.
Blazon search terms:
(charges.txt has keystone couped, pennsylvanian keystone, and their variants added)
Suggested group:
(I placed it in architecture)
<svg/charges/architecture>
OR<svg/charges/emblem>
. Architecture is more intuitive, but the symbol is more considered a symbol of Pennsylvania than an architectural element. I don't know which one I'd categorize it as to be honest.Blazon search terms:
(charges.txt has keystone couped, pennsylvanian keystone, and their variants added)
keystone couped, couped key, pennsylvanian wedge, pennsylvanian keystone, pennsylvanian keystone symbol, keystone symbol