"John Doe" and "Jane Doe" (for females) are multiple-use names that are used 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. Secondly, such names are also often used to refer to a hypothetical "everyman" in other contexts, in a manner similar to "John Q. Public" or "Joe Public". There are many variants to the "John Doe" and "Jane Doe" names, many others such include "John Roe", "Richard Roe", "Jane Roe" and "Baby Doe", "Janie Doe" or "Johnny Doe" (for children).\n', '

In other English-speaking countries, unique placeholder names, numbers and/or codenames have become more often used in the context of police investigations. This has included the United Kingdom, where usage of "John Doe" originated during the Middle Ages. However, the legal term John Doe injunction (or John Doe Order), has survived in English law and other legal systems influenced by it. Other names used informally such as "Joe Bloggs" or "John Smith" have sometimes been informally used as placeholders for an everyman in the UK, Australia and New Zealand; such names are seldom used in legal or police circles in the same sense as John Doe.\n', '

Well-known legal cases named after placeholders include:\n', '

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