In our Chinese culture, the number 4 is considered an unlucky number. I was told it is an unlucky number in Korean, Vietnamese and Japanese cultures too. It has the same pronunciation as the word 'death' in some languages.
Some interesting finds about the number 4 :
Nokia cell phones have no series beginning with a 4.
Palm PDAs and Canon PowerShot G has G3 and G5 series only.
In the early 2000s, Alfa Romeo introduced a new model 144 in Singapore. They had to change the model number when nobody bought it. :P
In Hong Kong and some parts of Asia, some buildings do not have a 4th floor. Particularly in some high-rise residential buildings in Hong Kong, ALL floor numbers with "4", (e.g. 4, 14, 24, 34 and all 40-49 floors ) are left out.
Although it is superstition, I do try to avoid the number '4' if I can. :)
Have a great weekend!
First commenter - Mojo