Editing Lock and key (section)

===Heraldry===
{{Commons category|Keys of Saint Peter in heraldry}}
Keys appear in various symbols and coats of arms, the best-known being that of the [[Holy See]]:<ref>{{cite book |last=Fox-Davies |first=Arthur Charles |year=1909 |url=https://archive.org/details/completeguidetoh00foxdrich |title=A Complete Guide to Heraldry |location=New York |publisher=Dodge Publishing  |isbn=0-517-26643-1 |lccn=09023803 |via=Internet Archive|page=291}}</ref> derived from the phrase in [[Matthew 16:19]] which promises [[Saint Peter]], in Roman Catholic tradition the first [[pope]], the [[Keys of Heaven]]. But this is by no means the only case.

<gallery mode="packed" heights="160">
File:Coat of arms Holy See.svg|[[Coat of arms]] of the [[Holy See]]
File:Siuntio.vaakuna.svg|A key pictured in the coat of arms of [[Siuntio]]
</gallery>