A plug-in hybrid electric vehicle (PHEV) is a hybrid vehicle with batteries that can be recharged by connecting a plug to an external electric power source. It shares the characteristics of both traditional hybrid electric vehicles (also called charge-maintaining hybrid electric vehicles[1]), having an electric motor and an internal combustion engine; and of battery electric vehicles, also having a plug to connect to the electrical grid (it is a plug-in vehicle). Most PHEVs on the road today are passenger cars, but there are also PHEV versions of commercial vehicles and vans, utility trucks, buses, trains, motorcycles, scooters, and military vehicles. They are sometimes called grid-connected hybrids, gas-optional hybrids, or GO-HEVs.

A plug could mean anything of the following
Plug (sanitation) for the plughole in the bathtub, washbasin and sink
Plug (fishing), a family of fishing lures
Plug (horticulture), a planting technique
an earplug for ear protection
An electrical connector, such as:
Power connector, including:
AC power plugs and sockets, for alternating current (mains electricity)
DC plug or DC connector, for direct current (small equipment)
Jack (connector) ...more

For plugging