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2. Master keying - Wikipedia

   en.wikipedia.org/wiki/Master_keying

   The differences are in the locks the key will operate. These master-keyed locks are configured to operate with two, or more, different keys: one specific to each lock (the change key), which cannot operate any of the others in the set, and the master key, which operates all the locks in the set. [1] Locks that have master keys have a second set ...

3. Key duplication - Wikipedia

   en.wikipedia.org/wiki/Key_duplication

   Some common examples of restricted key systems include master key systems, where a single key can open multiple locks within a building, and key control systems which allow for precise tracking of key usage and access control. Overall, restricted keys are an important tool for maintaining security and controlling access to sensitive areas.

4. Token (railway signalling) - Wikipedia

   en.wikipedia.org/wiki/Token_(railway_signalling)

   Conventional "trapped key" pin tumbler locks (held in fixed position by solenoids) are mounted in key-release units set up at each end of controlled single line. The number of locks in each unit is determined by the expected traffic frequency; optionally at times short sections may be combined to reduce the number of stops ( see Long section ...

5. Key relevance - Wikipedia

   en.wikipedia.org/wiki/Key_relevance

   Key relevance is the measure of similarity between the key and the optimal size needed to fit the lock, or it is the similarity between a duplicate key and the original it is seeking to replicate. Key relevance cannot be deduced from a key code, since the key code merely refers to a central authoritative source for designed shapes and sizes of ...

6. Skeleton key - Wikipedia

   en.wikipedia.org/wiki/Skeleton_key

   The normal key on the left will open only the lock that it goes to, but the skeleton key on the right will open any lock with this particular keyhole. Two warded lock keys and a homemade skeleton key. A skeleton key (also known as a passkey [1]) is a type of master key in which the serrated edge has been removed in such a way that it can open ...

7. Key code - Wikipedia

   en.wikipedia.org/wiki/Key_code

   The bitting code is used in conjunction with a key's Depth and Spacing Number to completely determine all relevant information regarding the key's geometry. [1] Each number in the bitting code corresponds to a cut on the key blade. For example, a bitting code of 11111 with Depth and Spacing Number 46 specifies a Kwikset key with five shallow cuts.