Hexakosioihexekontahexaphobia - is the fear of the number 666.
The funny thing about Hexakosioihexekontahexaphobia is that no one really knows what the actual symbolic meaning of the number 666 is. Many numerological studies have given plenty of interpretations but none of these have been substantial and nor have they been proclaimed as true by the Church. In short, 666 is like the shadow in the night that makes people fear the unknown. Somewhere down the line, someone said that 666 was the number or sign of the Satan but the Church never proclaimed this as true. God fearing Christians believe that the number 666 appears on the forehead or the hand of the sinner.