To go along with what the toastersaot said, I had a Japanese friend who always said shini-shini-goroshi, which is Japanese are the numbers in sequence, 42-42-564, and means "death-death-murder."
A lot of anime and other shows have used this number on doors, or in conversation. I cannot for the life of me remember the name of it, but I recall a horror/ suspense film that used those numbers for the hotel room number.
Also, 13 could be argued as well. Most Tarot card decks ( you know, the card decks fortune tellers use ) Death is the thirteenth trump card in most traditional Tarot decks. I know some people who like to try reading cards haha. Anyways, 13 is not just used as a representation of death, in many religions it bares significance. 1 + 3 = 4 in correlation to the cross, "dragon" is said to be in the Book of Revelations (Bible) 13 times, which represents
. Many other 13 blah blah blahs in relation to religion. the Code of Hammurabi, an ancient legal document did not have a 13th law. Also, the number 13 gets a bad rep as being believed to be a highly unlucky number.
[slayer-jinx-wink]