What I learned today…
1. (sales promotion definition) A preprinted advertising page(s), commonly offering coupons or other promotional activities, that is inserted into a separate publication, such as a newspaper.
2. (advertising definition) Preprint advertising of one or more pages that is loosely inserted between the pages of a newspaper or magazine.
See here for examples: http://images.google.com/images?hl=en&q=FSI+free+standing+insert&um=1&sa=N&tab=wi