Why Is There No 4th Floor in Some Japanese Hospitals?

Nine is Also Bad
4 isn’t the only villain. The number 9 is pronounced “Ku,” which sounds like “Suffering” or “Agony” (苦). Therefore, room numbers like “42” (Shini = To die) or “49” (Shiku = Pain and suffering) are often skipped in hospitals and apartment buildings to avoid bad luck for the residents.

Gift Giving Taboo
This superstition affects gift-giving too. Never give a wedding gift in a set of four (like 4 plates or 4 glasses). It implies you want the couple to “die.” Always go for sets of 3, 5, or pairs. Also, avoid giving Combs as gifts. Comb is “Kushi” (Ku + Shi), combining Suffering and Death. It’s a double curse!