Binding post

For the non-electrical fastener, see Sex bolt.
A binding post, colored red, which usually indicates a positive terminal.
A binding post, colored red, which usually indicates a positive terminal.
Two insulated, color-coded binding posts at the bottom center of a historical signal generator; modern devices often have bandwidths exceeding the utility of such connectors
Adapter between five-way binding posts and a male BNC connector
Uninsulated binding posts on a loudspeaker connected to banana plugs
Small black binding posts of an old loudspeaker driver are visible. These binding posts are not compatible with banana plugs of any size. Instead they were endowed with small solder contacts.

A binding post is a connector commonly used on electronic test equipment to terminate (attach) a single wire or test lead. They are also found on loudspeakers and audio amplifiers as well as other electrical equipment.