Call mark and Shelf mark

Call mark noun - A mark consisting of characters written on a book; used to indicate shelf location.

Shelf mark and call mark are semantically related in number assigned to a book topic. In some cases you can use "Shelf mark" instead a noun phrase "Call mark".

Call mark and shelf mark are semantically related in number assigned to a book topic. You can use "Call mark" instead a noun phrase "Shelf mark".