Symbolism of the number '4'

The way I got it was that they lived on the fourth floor Natre made it so that he couldnt leave the floor nor the building.

I know that in the Chinese culture in Asia (the chinese communitites in singapore, malaysia, china etc) 4 is considered an unlucky number because in Mandarin, and i think a few other chinese dialects, it sounds like the word used for 'death'.

In Japanese, "shi" means both 'death' and 'four'.

I don't think that is the intention of the director at all. I recall in the director comments that it is a co-incident (I watched that quite long ago so I may be wrong).

In Thai, the word die pronounce 'tie'(ตาย) which has nothing to do with 4 or See (similar to sea or see but different tone). However, since 14% of people in Thailand are Chinese descent, we know and use many Chinese word. Most Thai people know that the word die in Chinese pronounce like 4 but we rarely use it or concern it that much. The number we don't like is 6 (hok) which pronounce like fail.

I think the number 4 was what they just pick. It's not too high or too low.

Just my 2 cents

I know that somewhere in Asia 4 is usually skipped as a building floor, so it'd go 1 2 3 5 and so on. It would make the most sense that this was also the case in the film, so the floor didn't even really exist. Not necessarily the case here, but it's one way of looking at it.

I noticed that too and I was coming here to ask the same thing!