Tetraphobia is the practice of avoiding instances of the number 4. It is a superstition most common in East Asian nations. … The Chinese word for four sounds qu

Tetraphobia is the practice of avoiding instances of the number 4. It is a superstition most common in East Asian nations. … The Chinese word for four sounds quite similar to the word for death in many varieties of Chinese. Similarly, the Sino-Japanese, Sino-Korean, and Sino-Vietnamese words for four sound similar or identical to death in each language. Wikipedia's "Examples of sensitivity to tetraphobia applied" section is interesting: https://en.wikipedia.org/wiki/Tetraphobia https://en.wikipedia.org/wiki/Tetraphobia