Sipo is a word. What?

SIPO China National Intellectual Property Administration;

China National Intellectual Property Administration (China National Intellectual Property Administration), formerly known as People's Republic of China (PRC) and China Patent Office (hereinafter referred to as China Patent Office).

SIPO

Serial input and parallel output serial input and parallel output; Spacecraft Integrated Design Room of Spacecraft Integrated Project Office; = system installation productivity option, system installation auxiliary software (optional) option (IBM)