American Football NCAA Rule 2-16-4-b and c

b. A tee is a device that elevates the ball for kicking purposes. It may not elevate the ball’s lowest point more than one inch above the ground (A.R. 2-16-4-I). If utilized, a tee must be in contact with the ball for the kick to be legal.
c. A free kick place kick is a kick by a player of the team in possession while the ball is positioned on a tee or the ground. It may be controlled by a teammate. The ball may be positioned on the ground and contacting the tee.