Noun
A pair of trolley poles on a trolley bus
trolley pole (plural trolley poles)
A pole of wood or metal, used to transfer electricity from an overhead wire to power a tram, streetcar or trolley bus.
Modern trams often have an overhead pantograph mechanical linkage to connect to power, abandoning the trolley pole altogether. Source: Internet
P. 12 These trams, like virtually all others mentioned in this section, used either a trolley pole or a pantograph, to feed power from electric wires strung above the tram route. Source: Internet
The terms trolley pole and trolley wheel both derive from the troller. Source: Internet