noun
without a place of publication; sine loco; s.l.
Bibliographic term indicating that the place of publication is unknown or not stated. Used in cataloging and citations.
この古い本は出版地不明のため、図書館の目録に「s.l.」と記載されている。
Because this old book is without a place of publication, it is listed as 's.l.' in the library catalog.
Compound of 出版 (shuppan, 'publication') + 地 (chi, 'place') + 不明 (fumei, 'unknown').