pantograph

A mechanical linkage based on parallelograms causing two objects to move in parallel; notably as a drawing aid.

By extension, a structure of crosswise bars linked in such a way that it can extend and compress like an accordion, such as in a pantograph mirror or a scissor lift.

A pattern printed on a document to reduce the ease of photocopying.

(rail transport) A similarly-formed conductive device, now usually Z-shaped, that collects electric current from overhead lines for trains and trams.