def METHOD_NAME(self):
    r"""
    Return string representation of the backend
    OUTPUT:
    String.
    EXAMPLES::
        sage: from sage.repl.rich_output.backend_emacs import BackendEmacs
        sage: backend = BackendEmacs()
        sage: backend._repr_()
        'Emacs sage-mode'
    """
    return 'Emacs sage-mode'