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A lockset refers to a device that acts as a seal, including locks, keys and accessories. It is generally interpreted as "a seal that must be opened with a key." In addition to opening with a key, the lock can also be opened with instructions such as light, electricity, magnetism, sound, and fingerprints. Locks are not only protective equipment, but also have the functions of "management" and "decoration". There is also a kind of etiquette in international communication, which is to express friendship by giving a symbolic "key".