... is short for Quarterback Efficiency Rating, a more comprehensive, easily understood rating system that I devised to place the emphasis where it belongs—the ability of a quarterback to advance the ball, avoid negative plays, and score touchdowns in comparison to his peers. A rating of 100.0 is the league average.)

 

http://bleacherreport.com/articles/256842-brees-romo-mcnabb-are-week-1-qber-leaders

Bleacher Report - NFL