What does the key look like that the mailman uses for a master key?
The key that the mailman uses for a master key is called a **keychain key* or arrow key. It is a long, thin key with a pointed tip and a series of ridges on the side. The ridges on the side of the key correspond to the pins in a lock. When the key is inserted into a lock, the ridges on the key lift the pins up, allowing the key to turn and open the lock.
Mailmen use master keys to access multiple mailboxes in a single building. This allows them to deliver mail quickly and efficiently without having to carry around a large number of different keys.
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