National Toxics Inventory

Nielsen Television Index. Established in 1950, NTI provides audience estimates for all national broadcast network television programs. In 1987, this service began collecting data on nationwide television viewing on a daily basis using the People Meter.

Nielsen Television Index, national television report service of A.C. Nielsen.

NASCAR Technical Institute

Northern Telecom Incorporated Manufacturer of a wide variety of telecommunications related products.

Nuclear Threat Initiative

Non Thyroidal Illnesses

Network Termination Type 1 - a small box that attaches to an ISDN BR line