| Abbreviation | Definition |
|---|---|
| XE | Xtreme Eagles |
| XE | Xtreme Evolution |
| XEX | Xtreme Elite Xecutioners |
| XFB | Xtreme Finger Boarding |
| XFG | X- Files Game |
| XFL | eXtreme Football League |
| XFL | Xtra Fun League |
| XFO | Xtreme Flying Object |
| XFW | Xtreme Fantasy Wrestling |
| XG | Xtreme Gamer |
| XG | Xtreme Gun |
| XG | XtremeGamerz.com |
| XG3 | Extreme G Racing |
| XGL | Xtreme Gaming League |
| XGN | Xtreme Gaming Network |
| XGW | neXt Generation Wrestling |
| XGW | Xtreme Generation Wrestling |
| XGW | Xtreme Ghetto Wrestling |
| XGW | Xtreme Global Wrestling |
| XH | Xiled from Humanity |