This article is from the misc.writing Writing FAQ, by Wendy Chatley Green email@example.com with numerous contributions by others.
Pseudonym means "false name" (from the Greek for
false name, oddly enough). To use one, simply put it on the
front page of your manuscript (see title page example in
this FAQ). If your real name is in the upper left corner,
publishers will understand that you wish to be published
under a pen name.