House numbers have recently become popular in Feng Shui, their meanings have been taken from Chinese culture and are explained below. From the wikipedia.
In Chinese culture, certain numbers are believed by some to be auspicious or inauspicious based on the Chinese word that the number name sounds similar to. However some Chinese people regard these beliefs to be superstitions. Since the pronunciation and the vocabulary may be different in different Chinese dialects, the rules are generally not applicable for all cases.
Because of the supposed auspiciousness of certain numbers, some people will often choose, attempt to obtain, or pay large sums for numbers that are considered to be lucky for their phone numbers, street addresses, residence floor (in a multi-story building), driver’s license number, vehicle license plate number, bank account number, etc.
Lucky numbers are based on Chinese words that sound similar to other Chinese words. The numbers 6, 8, and 9 are believed to have auspicious meanings because their names sound similar to words that have positive meanings.
The number 2 is a good number in Chinese culture. There is a Chinese saying “good things come in pairs”. It is common to use double symbols in product brandnames, e.g. double happiness, double coin, double elephants etc. In Cantonese, two is a homophone of the character for “easy”
The number 3 sounds similar to the character for “birth” , and is thus considered a lucky number.
The number 5 is associated with the five elements (water, wood, fire, earth and metal) in Chinese philosophy, and in turn was historically associated with the Emperor of China. For example, the Tiananmen gate, being the main thoroughfare to the Forbidden City, has five arches. It is also referred to as “I” as the pronunciations of “I” and 5 are identical in Mandarin.
The number 6 in Mandarin is pronounced the same as “sleek” and similar to “fluid” and is therefore considered good for business. The number 6 also represents happiness. In Cantonese, this number is a homophone for blessings.
The number 7 symbolizes “togetherness”. It is a lucky number for relationships. It is also recognized as the luckiest number in the West, and is one of the rare numbers that is great in both Chinese and many Western cultures. It is a lucky number in Chinese culture, because it sounds alike to the Chinese character meaning arise.
The word for “eight” sounds similar to the word which means “prosper” or “wealth”. In regional dialects the words for “eight” and “fortune” are also similar, eg Cantonese “baat3” and “faat3”.
There is also a visual resemblance between two digits, “88”, and the (‘double joy’), a popular decorative design composed of two stylized characters meaning ‘joy’ or ‘happiness’).
A telephone number with all digits being eights was sold for USD$270,723 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).
The Horseshoe Casino, in Hammond, Indiana, USA, also chose 08/08/08 as the opening date for its new facility.
A man in Hangzhou offered to sell his license plate reading A88888 for RMB 1.12 million (roughly $164,000 USD).
Dragon Fish Industry in Singapore, a breeder of rare Asian Arowanas (which are “lucky fish” themselves, and, being a rare species, are required to be microchipped), makes sure to use numbers with plenty of eights in their microchip tag numbers, and appears to reserve particular numbers especially rich in eights and sixes (e.g. 702088880006688) for particularly valuable specimens.
The value of eight could also be linked with buddhism and the meaning of Lotus flower (eight petals).
As part of grand opening promotions, a Commerce Bank branch in New York’s Chinatown raffled off safety deposit box #888.
The number 9, being the greatest of single-digit numbers, was historically associated with the Emperor of China; the Emperor’s robes often had nine dragons, and Chinese mythology held that the dragon has nine children.
Moreover, the number 9 is a homophone of the word for “longlasting” , and as such is often used in weddings.
Tetraphobia is an aversion to or fear of the number
Number 4 is considered an unlucky number in Chinese, Korean, Vietnamese and Japanese cultures because it is nearly homophonous to the word “death”. 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.
In Singapore during the early 2000s, Alfa Romeo introduced a new model, the 144. Due to poor sales, the company changed the model number of the product.
Number 14 is considered to be one of the unluckiest numbers for Cantonese people. Not all Chinese people consider it to be an unlucky number as the pronunciation differs among the various dialects. In Chiu Chow, 4 is pronounced as “see” or “yes”.
It is seen to be a lucky number because Chinese people like things in pairs (four would equal two pairs). However, the superstitions regarding numbers from Cantonese people have been adopted by the other Chinese people.
Ironically, in the Rich Text Format specification, language code 4 is for the Chinese language.
Although five can represent “me” in Mandarin, it is usually associated with “not”. If used for the negative connotation it can become good by using it with a negative. 54 being “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”.
Six in Cantonese which has a similar pronunciation to that of “lok6” may form unlucky combinations.
Seven is considered spiritist or ghostly. The seventh month of the Chinese calendar is also called the “Ghost Month”. See Ghost Festival for more detail. During this month, the gates of hell are said to be open so ghosts and spirits are permitted to visit the living realm.
However, Chinese lunar calendar also has July 7th as Chinese Valentine’s Day (qi xi), so the number 7 is not generally associated with unluck. In most of the regions in China number 7 remains neutral or associate with luck.