Avcon is a company that manufactures charging interfaces for battery electric vehicles (EV). The lettering convention is Avcon for the company and AVCON (capitals) for the EV charging head.
The AVCON conductive interface was used by the Ford Ranger EV truck and the Honda EV Plus. The AVCON conductive EV charging system consists of a rectangular charging head (the male handle) which plugs into an AVCON inlet (the female receptacle) mounted on the vehicle. It is compatible with the November 2001 version of the SAE J1772 "SAE Electric Vehicle Conductive Charge Coupler" recommended practice for surface vehicles.
The American and Japanese plug-in vehicles that came to market in 2011 such as the Chevrolet Volt and Nissan Leaf use a round connector based on the 2009 revised SAE J1772 specification for level 2 charging.
Read more about Avcon: Conductive Versus Inductive Charging Systems - The Historical Battle, Success of The Conductive System, Charging Stations