Dodecaphobia

Dodecaphobia (from Greek dodeka, meaning "twelve") is the fear of number 12. This phobia is very rare and is barely mentioned in the media, often overshadowed by the very common fear of the next number, 13 (see Triskaidekaphobia). Dodecaphobes may be linked to the fear of 2012 phenomenon, where the supposed doom date is in the 12th month of 2012. They may have felt bad when the date was 12/12/12, especially for those who had tragic events occurring on that date, like the death of a loved one.

There is another, rather strange source of fear of 12, that if we put the random-number generator into a loop, the loop will not stop unless if it stops on a number other than 12. So the number 12 represents the symbol of infinite loop, so the fear of 12 is linked to the fear of infinity.

Sufferers would try avoid encountering the number 12, otherwise they would have obsessive thoughts about eternity. Many dodecaphobes would want to change the number of months in a year, such as having 13-month years as suggested by.