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See Lock (security device)

Lock may refer to:

• Lock (security device), a mechanical device used to secure items of importance.

• Lock (computer science), a bookkeeping object used to serialize concurrent access
• Lock (database), a feature used when multiple users access a database concurrently
• File locking, describes a mechanism that restricts access to a computer file
• SIM lock, a restriction on mobile phones to work only in certain countries or with certain providers

• Locker
• Locking
• Unlock