the.com/faraday cage

means An enclosure of conductive metal or mesh that blocks external electric fields by redistributing charge across its surface, shielding whatever's inside.

from Named for Michael Faraday, the 19th-century English scientist who demonstrated the effect in 1836 by building a room coated in metal foil and showing that an electroscope inside stayed utterly unmoved by an electrified exterior — proof that the charge stayed on the outside surface. He didn't call it a 'cage'; that word came later, once the idea shrank from room-sized experiment to the mesh-and-wire shields we build today.