While learning Chinese,  you need to be aware of the taboos of Chinese people, or else you may offend  your Chinese friends unintentionally when you get along with them. The use of  number in China is fairly particular, it is necessary to have a general idea of  the unlucky numbers in China.

In your Chinese  learning, you may have found that Number 4 (四sì) is nearly homophonous to  the word "death" (死sǐ). Due to that, many numbered product lines skip the "4":  e.g. Nokia cell phones (there is no series beginning with a 4). In East Asia,  some buildings do not have a 4th floor. In Hong Kong, some high-rise  residential buildings omit all floor numbers with "4", e.g. 4, 14,  24, 34 and all 40–49 floors, in addition to not having a 13th floor. As a  result, a building whose highest floor is number 50 may actually have only 35  physical floors.

Although five (五wǔ,) can represent "me" (吾wú) in Mandarin, it is  usually associated with "not" (無wú). If used for the  negative connotation it can become good by using it with a negative. 54 means  "not die" or "no death". If used for the positive it can be  used as a possessive. 528 is a way of saying "no easy fortune for  me". 53 sounds like "m4 sang1 （唔生）" – "not  live" in Cantonese.

In a Chinese  lesson, you may wonder why number seven seldom appears. Because seven is  considered spiritist or ghostly in China. The seventh month of the Chinese  calendar is also called the "Ghost Month". See Ghost Festival for  more detail. During the month, the gates of hell are said to be open so ghosts  and spirits are permitted to visit the living realm. However, the Chinese lunar  calendar also has the 7th day of the month as Chinese Valentine's Day (七夕qi xi), so the  number 7 is not generally associated with bad luck. In most of the regions in  China number 7 remains neutral or associated with luck.

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