There are 13 steps in the Final Document of the 2000 Review Conference of the Nuclear Non-Proliferation Treaty. These steps pertain to the disarmament of nuclear weapons in the event of a nuclear emergency.
Formula-1 cars cannot have the number 13.
Judas Iscariot, betrayer of Christ, was believed to be the 13th person to arrive at the Last Supper. Good Friday was also the day Christ was killed, which may have contributed to the Friday The 13th superstition.
13 is often associated with death by hanging. Most gallows had 13 steps leading up to the platform, though this is believed to be more about getting enough height for a decent neck-breaking drop than any sort of superstition. There were also believed to be 13 loops on a hangman’s noose, though this is considered myth–usually, six to eight loops were used.
Some believe 13 is shunned because it is seen as one more than the “perfect” number twelve. There are twelve signs in the Zodiac, twelve months to a year, twelve inches in a foot, and twelve hours on a clock.
Apollo 13 was launched at 13:13, and the mission was aborted April 13th.
Some believe that fear of the number 13 relates to the Code Of Hammurabi, the brutal Babylonian list of criminal punishments, where the 13th article is omitted. This is actually myth–the articles in the Code are not numbered.
Loki, lord of mischief and misrule, was the 13th god of the ancient Norse pantheon.
The following professional athletes are known for wearing the number 13: Alex Rodriguez, Dan Marino, Don Maynard, Wilt Chamberlain, Kurt Warner, Alessandro Nesta, Lindsay Whalen, Steve Nash, Mats Sundin, Michael Ballack.
Fear of Friday the 13th is called paraskevidekatriaphobia.
In 1881, Civil War veteran William Fowler put together a club called the Thirteen Club to end superstitions. The club had 13 members, and first met on Friday the 13th. The guests walked under ladders and sat among piles of spilled salt.
The number 13 creates disturbances in the economy due to businesses being unwilling to do business on that day and people not wanting to travel on that day. Approximately $900 billion is lost annually in the US due to triskaidekaphobia.
In Italy and at Colgate University, the number 13 is actually considered lucky.