Sine nomine

Sine nomine (abbreviated s.n.) is a Latin expression, meaning "without a name". It is most commonly used in the contexts of publishing and bibliographical listings such as library catalogs, to signify that the publisher (or distributor, etc.) of a listed work is unknown, or not printed or specified on the work. Compare with sine loco (s.l.), "without a place", used where the place of publication of a work is unknown or unspecified. While it may sometimes be used to disclose unknown authorship, this is more commonly indicated as anon. or similar.