Nixie

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Nixie

Slang; mail that is returned to the sender because its address is illegible, nonexistent or otherwise nondeliverable.
References in periodicals archive ?
"There are generations who have never seen a Nixie tube before so they are fascinated by them and think they are cool.
His creations can take anywhere between three weeks and a few months to complete depending on the complexity of the design But his biggest and most painstaking project was a 5ft tall Nixie tube clock robot named Wilson.
Nixie tubes were used in many electronic products such as petrol pumps, military equipment and early electronic desktop calculators.
If you have a touch of gray in what is left of your hair, you will remember the old Nixie tubes flashing their bright red numbers on many display panels.