A co-ax plug is the kind you'd expect to find on the end of the wire that comes from your TV aerial.

Professional male crimp coax connector

A high quality male TV Aerial Connector Plug with crimp type connection. Suitable for TV and FM/DAB radio connections. Provides the best connection possible without soldering, Suitable for use with most standard RG174/LMR100 type cables and crimping tools.

Also known as a female coax or IEC plug.