In Chinese tradition, certain numbers are believed by some to be auspicious (吉利jili) or inauspicious (不吉利bujili) based on the Chinese word that the number name sounds similar to. The numbers 6 and 8 are believed to have auspicious meanings because their names sound similar to words that have positive meanings.
The number 6 represents wealth in Cantonese, this number is a homophone for (祿 Lok). 6 (六, Pinyin: liù) in Mandarin is pronounced the same as "liu" (溜, Pinyin: liù) and similar to "flow" (流, Pinyin: liú) and is therefore considered good for business
The word for "eight" (8 Pinyin: bā) sounds similar to the word which means "prosper" or "wealth" (發 – short for "發財",Pinyin: fā). In regional dialects the words for "eight" and "fortune" are also similar, e.g., Cantonese "baat3" and "faat3".
There is also a visual resemblance between two digits, "88", and 囍, the "shuāng xĭ" ("double joy"), a popular decorative design composed of two stylized characters 喜 ("xĭ" meaning "joy" or "happiness").
The number 8 is viewed as such an auspicious number that even being assigned a number with several eights is considered very lucky.
· In 2003, A telephone number with all digits being eights was sold for CN¥2.33 million (approximately USD$280,000) to Sichuan Airlines in Chengdu, China.
· The opening ceremony of the Summer Olympics in Beijing began on 8/8/08 at 8 seconds and 8 minutes past 8 pm local time
· A man in Hangzhou offered to sell his license plate reading A88888 for ¥1.12 million (roughly $164,000). The Petronas Twin Towers in Malaysia each have 88 floors.
As for Number 4 (四; accounting 肆; pinyin sì) is considered an unlucky number in Chinese because it is nearly homophonous to 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 Western practice of some buildings not having a 13th floor because 13 is considered unlucky.)
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. As a result, a building whose highest floor is number 50 may actually have only 35 physical floors.