What is ‘Triskaidekaphobia’?

‘Triskaidekaphobia’ is a word that arises from the greek tris meaning three, and deka meaning ten, i.e. thirteen, and phobia meaning fear. Triskaidekaphobia thus means the fear of the ‘number thirteen’. In western culture, the number thirteen is often associated with ill luck. Many hotels in the western countries have no thirteenth floor, and many streets are avoided being given the number thirteen.