Triskaphobia

Triphobia or triophobia (from Greek/Latin tri, "three") is the fear of number three. People may fear that three represents the limited number of warnings till they are penalized or resulted in other bad outcome, like 'three strikes, you're out'. Sufferers would often avoid situations where three is often used, like counting to three. Three can sometimes be considered an unlucky number because of the three different superstitions: the middle person in the photograph will die first;, meaning the third person to light a cigarette from the same match or lighter, which originated during World War I when a sniper might see the first light, take aim on the second and fire on the third; and bad luck often comes in threes.