In China, many buildings don’t have a fourth floor. Or a fourteenth floor. Or a twenty fourth floor. You see, the Chinese word for the number four sounds a lot like the Chinese word for death. Don’t laugh; a lot of western hotels don’t have a thirteenth floor!
Chinese cultural tradition shuns the mention of death. I’ve heard stories of Chinese families who avoid telling elderly parents about the death of a family member, carrying on a pretense about that member being very busy and away on an extended trip, etc.