The NFL route tree is a numbering system used by both the offensive and defensive side of the ball to identify specific stems/breaks/directions that receivers run on passing plays.
Flat,Slant,Comeback,Curl,Out,Dig,Corner, Post and Fade
The Passing Tree is a numbered system used for the passing routes. The passing tree system is designed so that all even- numbered routes (2,4,6,8) are run towards the middle of the field and all odd-numbered routes (1,3,5,7,9) are be run towards the sideline.
