Utsava Murti translates as "Festival-Idol" in Sanskrit.
("picture from a festival") Image of a god who can
(and is supposed to) be moved.
These are often utilized during festivals, when the deity's
picture is carried about the town or city like a kingly procession,
symbolically inspecting his or her domain.
The sthala murti is another kind of Hindu picture that is
permanently placed in one location and never moves.