What is the architectural link that secures the apex of an arch or vaulted ceiling, used figuratively to refer to the central supporting element of a larger structure, such as a theory or an organization, without which the whole structure would collapse.?

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1. What is the architectural link that secures the apex of an arch or vaulted ceiling, used figuratively to refer to the central supporting element of a larger structure, such as a theory or an organization, without which the whole structure would collapse.?