IGS may stand for: Computers/Video Games. Information Global Service, Japanese video game company. Initial Graphics Exchange Specification, file extension .igs. InteGraphics Systems a former chip manufacturer. Interactive geometry software. Internet Go server, for the game of Go. IGS Go server, Japanese Go server. Technology. Image guided surgery. Information Gathering Satellites, Japan. Instrument guidance system. Science. Institute of General Semantics. Intergenic spacer. International Glaciological Society. International Graphonomics Society. International GNSS Service. Schools.
https://en.wikipedia.org/wiki/IGS