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Related to nixie: Nixie tube
nix·iealso nix·y (nĭk′sē)
n. pl. nix·ies Slang
A misaddressed or illegibly addressed piece of mail, therefore undeliverable.
(European Myth & Legend) German myth a female water sprite, usually unfriendly to humans
[C19: see nix]
a letter or parcel that is undeliverable because of a faulty or illegible address.
a female nix.
[1810–20; < German Nixe (Middle High German nickese, Old High German nicchessa; see nix2)]
nixie- Any piece of mail that is unable to be forwarded because it is illegibly or incorrectly addressed.
See also related terms for mail.