Abbreviation for rans uropean runked adio or Te rrestrial runked adio is a set of standards developed by the European Telecommunications Standardization Institute (ETSI) that describes a common mobile radio communications infrastructure throughout Europe.

TE rrestrial runked RA dio, typically used by utilities and emergency services. Thermal effect A heating effect.

Terrestrial Trunked Radio

referring to the number four ("tetragonus" = "four-angled")

A prefix meaning four.

A numerical prefix denoting one quadrillionth (10-15).

brightly colored tropical freshwater fishes

a complex system with many features and a high degree of customization to suit the requirements of individual networks and end users