What is a writers non de plum?

A writer's "nom de plume" is a pseudonym used by an author to conceal their true identity. This pen name allows writers to separate their personal lives from their professional work, explore different genres, or create a distinct brand. It can also provide privacy or allow for greater creative freedom. Famous examples include Samuel Clemens, who wrote as Mark Twain, and Mary Ann Evans, who published under the name George Eliot.