Why SRK's Dwarf film named “Zero”

Filmmaker Anand L Rai, who is directing "Zero", starring Shah Rukh Khan, Anushka Sharma and Katrina Kaif, said, "Zero" is the growth which he has been wanting after "Tanu Weds Manu Returns". The title and teaser of the movie were launched on New Year's Day. There were many speculations for the film’s titled which has been called ‘Dwarf’ since the subject was released, when asked about how and why they decided to name the movie as ‘Zero’