1. A fictitious name used to identify an unknown man or body. Also referred to as 'Jane Doe'.
2. An unidentified man.
3. An alias used in legal proceedings to identify an unknown male.
John Doe and is a multiple-use placeholder name that is used in the United States when the true name of a person is unknown or is being intentionally concealed. In the context of law enforcement in the United States, such names are often used to refer to a corpse whose identity is unknown or unconfirmed.