The Unlucky Number Four

Across many East Asian societies, a particular numeral carries a significant cultural weight, often associated with misfortune. This widespread aversion, known as tetraphobia, stems from a linguistic phenomenon where the pronunciation of the word for "four" closely mirrors the word for "death" in languages such as Mandarin Chinese (sì and sǐ), Japanese (shi), and Korean (sa). This phonetic resemblance has woven itself deeply into the fabric of these cultures, creating a pervasive superstition that influences various aspects of daily life.

The impact of this belief is evident in numerous practical applications. For instance, it is common to find buildings in these regions where the fourth floor, along with others containing the digit four (like 14, 24, or even 40-49), is conspicuously absent, often replaced by a "3A" or simply skipped entirely in elevator panels. This avoidance extends beyond architecture; businesses often steer clear of the number four in product serial numbers, phone numbers, and addresses. Even vehicle license plates and the numbering of military equipment, such as aircraft and naval vessels, may deliberately omit the digit to circumvent any perceived ill omens. This deep-seated cultural apprehension highlights how phonetic similarities can profoundly shape societal norms and practices across different eras.