What does SEGA mean?

The answer is: Service Games. SEGA, the gaming company that helped define console gaming in the '90s, is a contraction of the two words that make up the company’s name: Service Games. Originally the company was named “Standard Games,” but fortunately they realized that didn’t have much of a ring to it. Despite dropping out of the console business altogether, SEGA remains a powerful player in the software space to this day.Source