B1G1 = Buy one Get one FREE
BOGO = Buy one Get one FREE
CRT = Cash Register Tape - CVS store coupon found on the bottom of your CVS receipt or printed at the CVS Coupon Center or in your account on the CVS APP & CVS.com
ECB = Extra Care Bucks - CVS store money you get after making certain CVS purchases noted in the CVS Weekly Ad.
IP = Internet Printable - coupons that you can print from online sources like coupons.com
MFR = Manufacturer - coupon that comes directly from the maker of the product.
OOP = Out of Pocket - basically the amount you pay in cash, debit card, credit card, gift card, etc after using coupons.
OYNP = On Your Next Purchase
MM = Money Maker
NLA = No Longer Available
PG = Proctor + Gamble - coupon found once a month in local Sunday newspapers + PGGoodEveryday.com
QPON = Coupon
SS= Smart Source - coupon found in local Sunday newspapers and SmartSource.com
RMN = Retail Me Not - coupon found in local Sunday newspapers
UNL = Unilever - coupon found in local Sunday newspapers
YMMV - Your mileage may vary - basically not every store in your area/state/region will have the same policy, item or product.