Document : means any matter expressed or described upon any substance by means of letters, figures or marks, or by more than one of those means, intended to be used, or which may be used, for the purpose of recording that matter.

A writing is a document;
Words printed lithographed or photographed are documents;
A map or plan is a document;
An inscription on a metal plate or stone is a document;
A caricature is a document [Source Indian Evidence Act]