What is an rf connector, Coaxial cable connectors, Electrical connector, coax connectors

 U.FL Series 6 GHz 50 Ohm Receptacle Male Pin Ultra-Small Coaxial Connector

https://www.futureelectronics.com/p/interconnect--connectors-rf--bnc-connectors/u-fl-r-smt-01-hirose-electric-9715145