Multiple choice general knowledge What is the fear of number 13 called ? Xenophobia Arachnophobia Triskaidekaphobia Acrophobia Reveal answer Fill a bubble to check yourself C Correct answer Explanation Triskaidekaphobia is the specific phobia relating to the fear of the number 13. The term derives from Greek 'tris' (three), 'kai' (and), 'deka' (ten), and 'phobia' (fear).