UNDELIVERABLE MAIL Crossword Clue
UNDELIVERABLE MAIL Crossword Clue
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Crossword Puzzle Infos
Nixie is a term used to describe mail that is undeliverable. It is derived from the Nixie tube, an electronic device used in early computers and typewriters to indicate an error. The term is used to refer to mail that cannot be delivered due to incorrect or incomplete addresses, or other issues.