Final answer:
The coaxial cable used in a bus topology is known as a Backbone Cable, which is designed to minimize signal distortion and is also commonly used for cable TV and audiovisual needs.
Step-by-step explanation:
The coaxial cable that is looped through each networking device to transmit data in a bus topology is known as a Backbone Cable. This type of cable acts as the central conduit in a bus network, to which all the individual devices connect. Coaxial cables are specifically designed with a center core and an outer cylindrical conductor, separated by insulation, which allows for minimal signal distortion. This makes them ideal for not just bus topologies but also for cable TV and audiovisual connections where a clean signal is crucial.