you may have a point, I just know to some cultures its a bad luck symbol
I pulled this from the net
Number 4 (四; accounting 肆; pinyin sì) is considered an unlucky number in Chinese, Korean, Vietnamese and Japanese cultures because it is a homonym with the word "death" (死 pinyin sǐ). Due to that, many numbered product lines skip the "4": e.g. Nokia cell phones (there is no series beginning with a 4), Palm PDAs, Canon PowerShot G's series (after G3 goes G5), etc. In East Asia, some buildings do not have a 4th floor. (Compare with the American practice of some buildings not having a 13th floor because 13 is considered unlucky.) In Hong Kong, some high-rise residential buildings miss ALL floor numbers with "4", e.g. 4, 14, 24, 34 and all 40-49 floors. As a result, a building whose highest floor is number 50 may actually have only 36 physical floors.