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BNC connector

The BNC connector is a miniature quick connect/disconnect radio frequency connector used for coaxial cable. It is designed to maintain the same characteristic impedance of the cable, with 50 ohm and 75 ohm types being made. Wikipedia
Cable: Coaxial
Designed: 1940s
Diameter: Outer, typical:: 0.570 in (14.5 mm), male; 0.436 in (11.1 mm), female
Passband: Typically 0–4 GHz