Definitions for "Nixie"
A piece of mail matter which cannot be delivered, either because no post office exists at the place to which is it addressed, or because there is no place of the name mentioned in the designated State, Territory, or the like.
A piece of mail that's been returned to the sender due to incorrect address and forwarding was not guaranteed for delivery.
Mail "returned to sender," typically because the intended recipient is no longer at the mail's address, or because of problems with the address itself.
The nixie is a water-spirit with green skin and webbed appendages. It can charm other creatures to become its friend. Nixies are guardians of freshwater pools and streams and are most commonly spotted alone.
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See Nix.