+A keystone is the central, wedge-shaped stone at the apex of a masonry [Arch](/wiki/arch), locking all other stones into place. It is critical for the structural integrity of the entire [Structure](/wiki/structure), distributing weight and tension.
+## See also
+- [Arch](/wiki/arch)
+- [Masonry](/wiki/masonry)
+- [Vault](/wiki/vault)
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