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666 ...
For many people, just saying the number sends shivers up their spines, as it conjures up ominous images of secret occult ceremonies and the cataclysmic final days of Bible prophecy.
Some have even refused to accept phone numbers, license plates, and credit cards containing "666." There is even a very long word made up for the sole purpose of describing this superstitious phobia — "hexakosioihexekontahexaphobia."