In a master key system, all keys and cylinders have key symbols. These key symbols clarify where the cylinder fits into the master key hierarchy and what keys will operate it. A cross keyed cylinder is a cylinder that has multiple change keys operating it - instead of just one.
In DHI Nomenclature, cross keyed cylinders have a symbol that begins with an X. Non-cross keyed cylinders are not permitted to begin with an X as this clearly denotes cross keying.
The two types of cross keyed symbols are as follows:
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