In China, Japan, and Korea, the number 4 is so closely associated with death that buildings omit entire floors, hospitals renumber their wards, and consumer products are redesigned. Here's how a single phonetic coincidence shaped entire industries.
Take an elevator in a hospital in Shanghai, Tokyo, or Seoul, and you may notice the floor panel jumps from 3 to 5. Look for room 4 in a hotel — it may be labeled "3A" or simply skipped. Order a phone number and you will be charged a premium to avoid 4s, just as you would pay extra to include 8s.
This isn't superstition in the casual Western sense of knocking on wood. Tetraphobia — the avoidance of the number 4 — is a deeply embedded cultural force across East Asia, with measurable economic impact and architectural consequences that would astonish most Western visitors.
The root cause is phonetic. In Mandarin Chinese, the word for "four" (四, sì) is a near-homophone of the word for "death" (死, sǐ) — same syllable, different tone. The same collision exists in Japanese (shi = 4, shi = death) and in Korean (sa = 4, sa = death). Three major East Asian languages, independently evolved, happen to have created the same auditory danger zone around the same digit.
In Chinese culture, where homophonic word association drives much of the lucky/unlucky number system, this overlap made 4 one of the most avoided numbers possible. The consequences have been architectural, commercial, and social for centuries.
Sounds like 死 (sǐ) — death. Avoided in addresses, floors, phone numbers, hospital wards, gifts.
Sounds like 发 (fā) — prosperity, to get rich. Sought in addresses, phone numbers, license plates, business dates.
The most visible consequence of tetraphobia is in building numbering. Hotels, hospitals, and residential towers across China, Hong Kong, Taiwan, Japan, South Korea, and their diaspora communities routinely eliminate any floor containing a 4: no floor 4, 14, 24, 34, or 44. In Hong Kong, some high-rise buildings eliminate every floor whose number contains a 4, jumping from 39 to 50, or from 43 to 45. The floors physically exist — the concrete is poured — but they are numbered as if 4 were absent from mathematics.
A 2007 study by David Hirshleifer and Ming Jian found that homes with street addresses containing the number 4 sold for 2.2% less in Chinese-majority neighborhoods in California. The phobia travels with the diaspora.
Canon's camera naming conventions skip the "4D" designation in their EOS lineup. Nokia avoided the 4-series in Asian markets for mobile phones. In elevators manufactured for Asian markets, buttons for floor 4 are often omitted or replaced at the factory. When Mattel introduced Barbie in China, some product lines were renumbered. When Renault launched the R4 in certain Asian markets, they renamed it to avoid the association.
Phone numbers without any 4s command significant premiums in China. Numbers dominated by 8s — especially sequences like 888-8888 — have been auctioned for millions of yuan. The market literally prices in numerological belief.
The flip side of tetraphobia is the intense positive associations with the number 8. In Mandarin, 八 (bā) sounds like 发 (fā), meaning to prosper or become wealthy. The 2008 Beijing Olympics opening ceremony was scheduled to begin at precisely 8:08 PM on August 8, 2008 — 08/08/08 — a date so auspicious it was chosen years in advance. License plates with multiple 8s are auctioned at enormous prices. Business addresses containing 8s rent at premiums. A Sichuan Airlines phone number containing four 8s sold at auction for 2.33 million yuan.
Hospitals in East Asia often face particular pressure to remove 4s from their numbering. Chinese patients have been documented requesting room changes when assigned to room 4, 14, or 44. Some hospitals go further than simply renaming wards — they design the physical layout to eliminate the number entirely. A ward might go 1, 2, 3, 3A, 5, and the renaming is considered a genuine act of patient care.
In Western numerology, 4 is the number of stability, hard work, and solid foundations — a very different reading from its East Asian counterpart.
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