Catchword

Custodian ( guardian or leaf ) is the name for the attached in the lower right corner of the page indicating the initial syllable or the first word of the next page. Primary, it represents an aid in collating before Bookbinding and so ensures the correct order of the pages.

It is thus one like the arc signature, the leaf or page number to the organization aids of books.

The supervisor has been used before emergence of the industrial production of books and is no longer used in modern book printing.

In manuscripts of the Middle Ages supervisor is also the name of the layers by numbers or letters. The initial word of the result sheet is written down on the previous sheet and also means Reklamante. This enabled the control of the correct text connection. Claimants are found very frequently in manuscripts of the Arabic-Islamic cultural area.