O & O station
Radio and television stations owned and operated by a network.
Off card
Refers to advertising time sold at a rate that does not appear on the rate card.
On-air tests
Tests recall among viewers of a commercial or program during a real broadcast of the tested communication.
On-pack (On-pack Premium)
Used to promote sales of a product. Discount coupons or gifts that are attached to or accompany the product to be purchased.
Open end
(1) Time left at the end of a commercial or program which is provided for the use of local advertising or station identification.
(2) A radio or television program with no specific time to end.