It often refers to early TV sets that accepted signals from an antenna or VCR only via a coaxial cable. Modern TVs have coax inputs plus inputs that use RCA phono and HDMI cables. See F connector.

A new way to get broadband around your home is on the market, and it arrives in the form of Ethernet over coax cable. It is not meant to be a replacement for Ethernet cables, but rather to help ...

allowing long-range video transmission of HDMI 2.0 standard video and audio signals with only one coaxial cable. They support 444 color video transmission of 4K@60 HDMI 2.0 / HDCP 2.2. Most important: ...