Peyton wears #18 as a tribute to his older brother, Cooper, whom he played with in high school. Cooper was a great wide receiver, but he had to stop playing due to spinal stenosis. Peyton would have worn #18 in college, but the number was already taken when he got to Tennessee so he chose 16. When he got to Indianapolis, 18 was available & he chose it to honor Cooper. His father Archie also wore #18 for the Saints.