Zero 0 零
The Number 0 (零) is a whole number and it is also an even number for the money ends with 0.
Two 2 二
The number 2 (二) is most often considered a good number in Chinese culture. There is a Chinese saying: "good things come in pairs". It is common to repeat characters in product brand names, such as double happiness, which even has its own character 囍, a combination of two 喜. In Cantonese, two (jyutping: ji6) is homophone of the characters for "easy" (易) and "bright" (亮). In Northern China, the number, when used as an adjective, can also mean "stupid".
Three 3 三
The number 3 (三) sounds similar to the character for "birth" (生, Pinyin: shēng, jyutping: saang1), and is considered a lucky number. The number 3 is significant since there are three important stages in a man’s life (birth, marriage and death).
Five 5 五
The number 5 (五) is associated with the five elements (Water, Fire, Earth, Wood, 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 the pronoun "I", as the pronunciations of "I" (我, Pinyin: wŏ, and 吾, Pinyin: wú) and 5 are similar in Mandarin. In Cantonese, this word has the same pronunciation as the character 唔 and means "not", pronounces (m̀h). This word has the same meaning and use as the word 不 an therefore is usually negative.
Seven 7 七
The number 7 (七) "chut" (Cantonese) 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 word 起 (Pinyin: qǐ) in Mandarin meaning arise, and also 气 (Pinyin: qì) meaning life essence. In Cantonese it sounds like the verb "to leave" which adds emphasis. For example, three and seven together in Cantonese emphasizes that you not only are able to grow, but you can also grow out of any situation you might be trying to have. It is for this reason it is auspicious. If it was combined with the numbers 4 and 5, i.e. 457, this would be extremely inauspicious as it would translate literally to "Death does not allow you to leave" or interpreted "Even in death you cannot escape."
Eight 8 八
The word for "eight" (八) sounds similar to the word which means "prosper" or "wealth" (發 – often paired with "發財" during Chinese New Years, but is used alone or paired with numerous other "compound words" that have a meaning of luck or success,Pinyin: fā). In regional dialects the words for "eight" and "fortune" are also similar, e.g., Cantonese "baat3" and "faat3". Note as well, this particular symbol matches the mathematical symbol of infinity. While Chinese does have other words for luck, this full understanding of luck that includes the infinity concept marries into a Chinese understanding of this particular word.
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 US$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 (UTC+08).
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.
The minivan that GM makes for the Chinese market is called the Buick GL8, but the minivans it sold in other countries didn't have that name.
The Air Canada route from Shanghai to Toronto is Flight AC88.
The KLM route from Hong Kong to Amsterdam is Flight KL888.
The Etihad Airways route from Abu Dhabi to Beijing then onwards to Nagoya is Flight EY888.
The United Airlines route from Beijing to San Francisco is Flight UA888, the route from Beijing to Newark is Flight UA88, and the route from Chengdu to San Francisco is Flight UA8.
The Air Astana route from Beijing to Almaty is Flight KC888.
The British Airways route from Chengdu to London is Flight BA88.
One of Cathay Pacific's flight numbers from Hong Kong to Vancouver and New York is CX888.
Singapore Airlines reserves flight numbers beginning with the number 8 to routes in China.
SriLankan Airlines reserves flight numbers beginning with the number 8 to routes in China.
The US Treasury has sold 70,000 dollar bills with serial numbers that contain 4 eights.
In Singapore, a breeder of rare Dragon fish (Asian Arowana) (which are "lucky fish" 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.
As part of grand opening promotions, a Commerce Bank branch in New York's Chinatown raffled off safety deposit box No. 888.
An "auspicious" numbering system was adopted by the developers of 39 Conduit Road Hong Kong, where the top floor was "88" – Chinese for double fortune. It is already common in Hong Kong for ~4th floors not to exist; there is no requirement by the Buildings Department for numbering other than that it being "made in a logical order." A total of 43 intermediate floor numbers are omitted from 39 Conduit Road: those missing include 14, 24, 34, 54, 64, all floors between 40 and 49; the floor number which follows 68 is 88.
Similar to the common Western practice of using "9" for price points, it is common to see "8" being used in its place to achieve the same psychological effect. So for example menu prices like $58, $88 are frequently seen.
Nine 9 九
The number 9 (九), was historically associated with the Emperor of China, and the number was frequently used in matters relating to the Emperor, before the establishment of the imperial examinations officials were organized in the nine-rank system, the nine bestowments were rewards the Emperor made for officials of extraordinary capacity and loyalty, while the nine familial exterminations was one of the harshest punishments the Emperor sentenced; the Emperor's robes often had nine dragons, and Chinese mythology held that the dragon has nine children. It also symbolizes harmony.
Moreover, the number 9 is a homophone of the word for "long lasting" (久), and as such is often used in weddings. It is also a homophone for the words "to have enough", "to save". Hence, when you put it with other words that are lucky, it emphasizes the benefit of that number 89 (To have enough luck), 29 (to easily have enough), 39 (grow enough). Here the word enough means more "to have that which you need to achieve your goals" vs. "just enough." When combined with the number 4, it's still not necessarily auspicious.
Number 4 (四) 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 (before the Lumia 640, there is no series containing a 4 in the name), 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, 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. Singaporean public transport operator SBS Transit has omitted the number plates for some of its buses whose numbers end with '4' due to this, so if a bus is registered as SBS***3*, SBS***4* will be omitted and the next bus to be registered will be SBS***5*. Note that this only applies to certain buses and not others and that the final asterisk is a checksum letter and not a number. Another Singaporean public transport operator SMRT has omitted the '4' as the first digit of the serial number of the train cars as well as the SMRT BusesNightRider services.
Five 5 五
Five (五) is associated with "not" (Mandarin 無, pinyin wú, and Cantonese 唔 m4). If used for the negative connotation it can become good by using it with a negative. Thus, 54 means "no death". 53 ("ng5 saam1" in Cantonese) sounds like "m4 sang1 （唔生）" – "not grow" or alternatively in specific context "not live".
Six 6 六
Six in Cantonese which has a similar pronunciation to that of "lok6" (落, meaning "to drop, fall, or decline") may form unlucky combinations.
Seven 7 七
A variant of Seven(七) in Cantonese is a swearing word pronounced "chat9"(柒, meaning fool), as well, its pronunciation is similar to "痴"(means mad) in Mandarin. Seven is the second single digit unlucky number with less of a bad connotation than 4 in Cantonese society.
167, 169, 1679: In Hong Kong, seven (七) and nine (九) both have similar pronunciations to and, respectively, two of "the five most insulting words" in Cantonese – the male genital. Six in Cantonese also has a similar pronunciation to an impolite word which is used to count the number of cylindrical objects. Therefore, 167, 169, 1679 and other creative combinations (such as the infamous taboo "on-9-9") are dirty jokes in Hong Kong culture.
250: In Mandarin, 250 can mean "imbecile" if read in a certain way. 二百五 (èr bǎi wǔ), while literally being a correct way of reading 250 in informal speaking, is usually used to insult someone the speaker considers extremely foolish. Alternative ways such as 兩百五 (lǐang bǎi wǔ) and 二百五十 (èr bǎi wǔ shí) do not have this meaning. There are several different versions of the origin of the use of 250 as an insult, and it is unclear which one is correct.
5354: "唔生唔死" (m4 saang1 m4 sei2 in Cantonese) sounds like "not grow, not dying". This often refers to something that is in a bad place, but can neither end the misery or grow out of it. Also in Cantonese, it refers to something that is done in a way that is improper as in shady. You might refer to an improper look this way. You night also describe the way someone who does business in a shady manner as 唔生唔死.
1314: "一生一世" This sounds like "one life, one lifetime" in both Mandarin and Cantonese, and is often used romantically, akin to "for better, for worse, for richer, for poorer, in sickness and in health, until death do us part" in English.
768: "七六八" (jyutping: cat1 luk6 baat3) rhymes with the phrase "一路發" (jyutping: jat1 lou6 faat3) in Cantonese, which means "fortune all the way." Alternatively, 168 "一六八" is sometimes used for the same term in Mandarin.
7456: In Mandarin, 7456 (qī sì wǔ liù) sounds marginally like "氣死我了" (qì-sǐ wǒ -le, "to make me angry," "to piss me off"), and is sometimes used in internet slang.
9413: "九死一生" (gau2 sei2 yat1 saang1 in Cantonese) – nine die to one live, meaning 90% chance of being dead and only 10% chance of being alive, or survived from such situations (a narrow escape).
521/5211314: In Mandarin it is pronounced wu er yi, it sounds similar to wo ai ni. Which means I love you. 1314: also sounds like forever in Cantonese. yut sung yut sei. which means one life one death in literal terms. Therefore, 5211314 means I love you forever.
748: "七四八" In Mandarin this number is pronounced "qī sì bā". If these numbers are stated in certain tones, it has a meaning which roughly translates into: "Why don't you go die?" "去死吧" This combination is more commonly used as an insult to others, or rather, an indirect death threat. Youngsters can jokingly tease each other by saying "你去死吧!". Depending on the mood, place and way of saying this sentence it can confer meanings ranging from joking to insulting or provoking. On the other hand, any 3 digit number that ends with 48 sounds like "wealthy for X live times" (世發) (e.g. 748[七世發] is wealthy for 7 live times"), thus is generally considered lucky, with 448 and 548 being the exceptions since they are also homophones of "死先發"(Wealthy on death) and "唔洗發"(no need/not going to be wealthy).
518: "五幺八" (Mandarin: wǔ yāo bā) In this, for the number to work, "一"(yī, one) must be read as "yāo"(幺), which is another way in Mandarin to say one, often used when giving phone numbers. "wǔ yāo bā" sounds like "wǒ yào fā" or "我要发" which means "I am going to/will soon prosper".
Any number of repeated 5s: "五" (wǔ) sounds like an onomatopoeia for crying, and is sometimes used in internet slang.