Signature mark

A signature mark, in traditional bookbinding, is a letter, number or combination of either or both, which is printed at the bottom of the first page, or leaf, of a section.

The practice has been superseded by advances in printing and bookbinding technology.

As a result, signature marks are rarely found in modern books.

[2] A number of symbols traditionally used as binding signature marks were encoded in ISO 5426-2[3] and from there (to enable migration of data from the old standard) were transposed into Unicode.

These latter two are the only codepoints in Unicode 4.0 to bear the annotation "binding signature mark".