SPI

Simulations Publications, Inc., often abbreviated to SPI, was an American publisher of board wargames in the 1970s and early 1980s. It produced an enormous number of games, including many that were considered good and innovative, and changed the course of the wargaming hobby with its bid to take control of the hobby away from then-dominant Avalon Hill. It went bankrupt in 1982.
(Quoted from SPI page on Wikipaedia.)

Links:

• SPI's Wikipaedia page