The first coupon was created in the late 1800s by the Coco Cola Company good for free drinks.
It all depends on the business. Often times there is no limit, but only 1 can be used per purchase.
There a ton of abbreviations it would be helpful to know when it comes to couponing.
CC - Credit Card
BOGO - Buy One Get One
NIB - New in Box
FS - Free Shipping
GDA - Good Deal Alert
NED - No Expiration Date