UHF. (SO 239 / PL 259, 83-1R, coaxial)
UHF connectors are a threaded connector designed for shielded unbalanced cable runs, typically into the medium radio frequencies.
Benefits:
Robust format.
Center socket will accept banana plug.
Moderate pricing
Drawbacks:
Somewhat uncommon.
No native jack switching to allow normalization.
It is not uncommon to find the UHF plug adjacent a binding post in the 3/4 inch on center format to allow interconnect with the dual gang banana plug.