In Japan, the number four is avoided because it sounds very similar to the word for death. In the same vein as the number 13 in Western culture, the number four is extremely unlucky and is used as little as possible. Elevators will often be missing a fourth floor – and in some extreme cases, they will not have the floors 40-49. The number 49 is especially unlucky, as it sounds similar to the phrase which means ” pain until death .”
The practice of avoiding the number four is called ” Tetraphobia ,” and is common in many East Asian and Southeast Asian regions.