the world > space > extension in space > measurable spatial extent > smallness > [adjective] > of small or scanty extent > compact > compact thing (3)
Of a camera or (in later use) other device: designed to be held and operated in the hand. Also (of a shot): taken with such a camera.
(a) held in the hand; also figurative; (b) spec. in Equestrianism: used in or involving the leading of a horse by hand.
Esp. of a computer: small enough to be held and used in the palm of the hand.