A type of plug used to connect speaker cables to amplifiers and speakers. Recently abandoned due to European legislation because they are a similar size to electric power outlets in some European countries. Now generally replaced by binding post terminals on amplifiers.

an electrical connector designed to join audio wires such as speaker wires to the binding posts on the back of many power amplifiers, or to special jacks called, of course, banana jacks

a plug that has a spring-metal tip which somewhat resembles a banana, used on test leads or as terminals for plug-in components

Banana shaped speaker termination that consists of an approximately 1/8-inch-wide and 1-inch-long plug that goes into the back of a binding post or inset banana plug terminal on a speaker, amp or receiver.