The pointy metallic type, not the navigating type.
Most people think of a compass as a "magnetic compass", which points to the Earth's magnetic north and south poles. The pointy metallic type is a drawing tool, usually used to draw circles or arcs. They may also be used to measure distances on maps. Compasses typically have two legs — one with a spike that secures the compass in place, and the other with a holder for attaching a pencil to.
Can be found in many schools, stationery stores and architecture studies.