Negotiable Instruments Act, 1881
15. Endorsement
When the maker or holder of a negotiable instrument signs the
same, otherwise than as such maker, for the purpose of negotiation on the back
or face thereof or on a slip of paper annexed thereto, or so signs for the same
purpose a stamped paper intended to be completed as a negotiable instrument, he
is said to endorse the same, and is called the "endorser".