call number
Noun
Meaning
a mark consisting of characters written on a book; used to indicate shelf location
Source: WordNetSynonyms
pressmark
call mark
caller-ID
phone number
directory number
calling number
caller number
caller id number
toll free numbers
shelf mark
telecommunication number
with the telephone number
badge number
emergency call number
one telephone number
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Examples
In that email he included a picture of the new “tag” he’d applied to the spine, in which he’d written the call number with a fine-point sharpie.
The domestic conference call number is (800) 289-0448.
The teams designated by the color of their bandannas get their first clue and are off to find the next clue hidden in the book found by using the call number.