pantograph
A mechanical linkage based on parallelograms causing two objects to move in parallel; notably as a drawing aid.
A pantograph can be adjusted to make either scaled or exact copies.
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.
I was impressed by the quality of the pantograph; I hadn't noticed it on the original, but the copies were covered in unpleasant lines.
A similarly-formed conductive device, now usually Z-shaped, that collects electric current from overhead lines for trains and trams.
Where it comes from
From French pantographe, from panto- (from Ancient Greek παντός (pantós), genitive singular of πᾶν (pân, “all”)), and -graphe (from γράφειν (gráphein, “to write”)).
Adapted from the Wiktionary entry pantograph (CC BY-SA 4.0).