Q4E stands for Quest for Excellence (Indianapolis, IN)
Q4 stands for Fourth Quarter Q4 stands for Quake 4 (game) Q4 stands for Fourth Quartile (statistics)
Q3X stands for QuickDraw 3D Extension
Q3UT stands for Quake 3 Urban Terror (video game)
Q3TA stands for Quake 3: Team Arena (Quake 3 expansion pack)
Q3R stands for Quake 3 Radiant (design tool)
Q3H stands for Every 3 Hours
Q3F stands for Quake 3 Fortress
Q3D stands for Quasi-Three-Dimensional
Q3A stands for Quake 3 Arena