GGX meaning in General ?

Guilty Gear X (Japanese: ギルティギア ゼクス, Hepburn: Giruti Gia Zekusu), subtitled By Your Side in Japan, is a fighting game developed by Arc System Works and published by Sammy Studios. The second installment of the Guilty Gear series, Guilty Gear X was developed over a period of about two years after the first game's success. It was released in July 2000 for Japanese arcades, re-released on Dreamcast in December 2000, and later ported to PlayStation 2 in November 2001 and Game Boy Advance in January 2002.

Guilty Gear X continues its predecessor's timeline with new characters and gameplay features. A four-button game, its instant-kill techniques were weakened and a survival mode was added to the previous game's three modes. The Dreamcast and PS2 versions have sold over 100,000 copies in Japan; they have been praised for their graphics, controls and characters but criticized for their lack of replay value. The GBA version was the poorest-received, with the main complaints concerning ease and graphics.