A literary pen name is a pseudonym used by authors when they want to remain anonymous or separate their personal identity from their work. Charles Dickens was known by the pen name 'BOZ' (3 letters), while Charles Lamb wrote under the name 'Elia' (4 letters). The British author Hector Hugh Munro wrote under the pen name 'Saki' (4 letters), and the American poet T.S. Eliot wrote under the name 'Eliot' (5 letters).