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A pseudonym or allonym is a name, (sometimes legally adopted, sometimes purely fictitious), used by an individual as an alternative to their birth name.

When used by authors, a pseudonym is also called a pen name or (in French) nom de plume. This is an English expression: in France, such an alias is more commonly termed a nom de guerre, or "name of war".

When used by actors, performers, or models, a pseudonym is also called a stage name (or sometimes "screen name")

Famous pseudonyms of people who were neither authors nor actors include:

On the internet, pseudonymous remailers utilising cryptography can be used to achieve persistent pseudonymity, so that two-way communication can be achieved, and reputations can be established without linking a physical identity to a pseudonym.

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