名詞 pressmark:

1. a mark consisting of characters written on a book; used to indicate shelf location
   同義詞：call mark, call number

press.mark

n.（名詞）
Printing A notation or figure in the margin of a printed sheet indicating the press on which it was printed.
【印刷術(shù)】 印刷標(biāo)識：在印刷紙張的邊上的表明是何家印刷的標(biāo)記或記號
Chiefly British A notation in or on a book indicating where it should be placed in a library.
【多用于英國】 書架號：書里或書面上表明該書在圖書館的放置位置的記號