I spotted this in a GPO press release communicated from the Prime Minister's Office:
Schedule for PM Netanyahu's Address
(Communicated by the Prime Minister's Media Adviser)
Prime Minister Benjamin Netanyahu will, tomorrow (Tuesday, 3 March 2015), address a joint session of the US Congress. The schedule of events is as follows (all times US Eastern Standard Time):
...10:25 – Meet with US House of Representatives Speaker John Boehner (R-OH). Speaker Boehner will present PM Netanyahu with a head sculpture of Winston Churchill with an inscription of the PM's name and the date of his address.
I was taught that the term is a "bust".
a sculptured, painted, drawn, or engraved representation of the upper part of the human figure, especially a portrait sculpture showing only the head and shoulders of the subject"