Triskaidekaphobia is fear of the number 13. It is usually considered a superstition.
It is linked to the fact there were 13 people at the last supper of Jesus Christ and also to that fact that a lunisolar calendar must have 13 months in some years, while the solar Gregorian calendar and lunar Islamic calendar always have 12 months in a year.
Triskaidekaphobia may have also affected the Vikings - it is believed that Loki in the Norse pantheon was the 13th god. This was later Christianised, into saying that Satan was the 13th angel.
Some buildings number their floors so as to skip floor 13 entirely, jumping from floor 12 to floor 14 in order to avoid distressing triskaidekaphobics, or using 12a and 12b instead.
A specific fear of Friday the 13th is called paraskavedekatriaphobia.
One famous figure to have suffered from triskaidekaphobia was the composer Arnold Schoenberg.
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