Section 16(1) in The Negotiable Instruments Act, 1881
(1)If the indorser signs his name only, the indorsement is said to be “in blank”, and if he adds a direction to pay the amount mentioned in the instrument to, or to the order of, a specified person, the indorsement is said to be “in full”, and the person so specified is called the “indorsee” of the instrument.