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- UL listed
- adj. listed in a directory as having passed specific Underwriters Laboratories testing
- unassociated change key
- n. a change key which is not related directly to a particular master key through the use of certain constant cuts
- unassociated master key
- n. a master key which does not have change keys related to its combination through the use of constant cuts
- uncombinated
- adj. 1. of or pertaining to a cylinder which is or is to be supplied without keys, tumblers and springs 2. of or pertaining to a lock, cylinder or key in which the combination has not been set
- uncontrolled cross keying
- n. a condition in which two or more different keys under different higher level keys operate one cylinder by design; e.g., XAA1 operated by AB, AB1. Note: This condition severely limits the security of the cylinder and the maximum expansion of the system, and often leads to key interchange
- unibolt
- n. a single plate of steel used in place of individual multiple bolts to lock a safe door
- unidirectional cylinder
- n. a cylinder whose key can turn in only one direction from the key pull position
- USB key
- n. a hardware key connected to a USB port
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