Early Adopters
Those who are among the first to buy a new product or service, typically in a new product or service category, when it is launched.
Early Majority
The large portion of the market that tends to adopt a new product or service (typically in a new product or service category) only after it has gained some level of acceptance and credibility in the market.
End Matter
(Also called "back matter.") Items placed after the main body of a document. Examples of end matter include appendices and indices.
Envelope Stuffer
An advertising piece included in an envelope used primarily to deliver other business correspondence such as invoices, letters, etc.