Why is a stripped Treasury security identified by whether it is created from the coupon or the

Question:

Why is a stripped Treasury security identified by whether it is created from the or the principal?
Coupon
A coupon or coupon payment is the annual interest rate paid on a bond, expressed as a percentage of the face value and paid from issue date until maturity. Coupons are usually referred to in terms of the coupon rate (the sum of coupons paid in a...