= C =
chad box n.
A metal box about the size of a lunchbox (or in
some models a large wastebasket), for collecting the chad
(sense 2) that accumulated in Iron Age card punches. You had
to open the covers of the card punch periodically and empty the
chad box. The bit bucket was notionally the equivalent device
in the CPU enclosure, which was typically across the room in
another great gray-and-blue box.
--The Jargon File version 4.3.1, ed. ESR, autonoded by rescdsk.