Wikipedia has an entire entry dedicated to kadigans (which are more reasonably referred to as “placeholder names.”). An entire entry, in other words, dedicated to the doodad, the whatchamacallit, and East Jesus, USA.
(via The Morning News)
History of the thingamajig
Posted by Ben on March 27, 2005
https://www.swordbilled.com/history-of-the-thingamajig/