Wiki article on lucky and unlucky numbers:
http://en.wikipedia.org/wiki/Number...nese_cultureThe number 4 in Chinese sounds like the word 'death' so is considered unlucky. Compared to the Western practice of some buildings not having a 13th floor as the number 13 is considered unlucky.
Anything that starts with 4 is bad. This would include day 4, year 4, month 4, number 4 on a street, 4 stamps on an envelope, 4 anything really.
Same as the number 8 is considered lucky as it sounds like the words 'prosper' and 'wealth' . In regional dialects the words for "eight" and "fortune" are also similar. Double 8 '88' in Chinese looks like the popular symbol for double joy. The number 8 is viewed as such an auspicious number that even being assigned a number with several eights is considered very lucky.