This SAE Aerospace Recommended Practice (ARP) defines the nomenclature of temperature measuring devices. General temperature measurement related terms are defined first, followed by nomenclature specifice to temperature measuring devices, particularly thermocouples. To establish the nomenclature and related terminology of temperature measuring devices as applied to aircraft gas reaction type power plants for use by: (a) power plant manufacturers, (b) airframe manufacturers, (c) procurement organizations, (d) equipment organizations, (e) service and maintenance personnel, and (f) other interested organizations.