dodecaphobia

From dodeca- (“twelve”) +‎ -phobia.

dodecaphobia (uncountable)

1. Fear of the number 12.
   • 2017, Doug Lowe, Java All-in-One, 5th edition:

     Suppose that you wanted to make a random-number [generator] that returns [all] random numbers between 1 and 20 [but] 12 (because you have […] dodecaphobia which […] is the fear of the number 12).

   • 2019 June, “Five phobias you didn’t know existed”, in BBC Bitesize‎^[1]:

     There’s also dodecaphobia, which is the (again, unofficial) fear of the number 12[.]

   • 2022, Hana Tooke, The Midnighters:

     Dagmara read the next title. “‘Dodecaphobia’?”
     “There is something very troubling about the number 12,” Ema said gravely.

• There are 12 letters in dodecaphobia.