Tetraphobia

An elevator control panel in a residential apartment building in Shanghai with no floor numbered as the 4th
The number 4 missing in a parking lot in Japan

Tetraphobia (from Ancient Greek τετράς (tetrás) 'four', and Ancient Greek φόβος (phóbos) 'fear') is the practice of avoiding instances of the digit 4. It is a superstition most common in East Asian nations and is associated with death.[1]

  1. ^ Havil, Julian (2007). Nonplussed: Mathematical Proof of Implausible Ideas (Hardcover). Princeton University Press. p. 153. ISBN 978-0-691-12056-0.

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