Keystone

Keystone refers to a central stone at the summit of an arch, locking the other stones in place and providing crucial support. It is typically larger or more ornate than the surrounding stones, serving as a key element in the overall structure's stability and integrity. In a broader sense, the term can also be used metaphorically to describe something essential, pivotal, or indispensable within a system or organization.




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Keystone
Keystones