Crossing fingers comes from the pre-christian practice of Europe. Originally it was performed with two people crossing their index fingers in such a way that their fingers formed a solar cross. The solar cross was considered a symbol of perfect unity and at the point of intersection it was considered that there were beneficial spirits residing there. If a wish were made on the intersecting point of the solar cross then it (the wish) was anchored there until such time as the wish came true. Gradually the custom evolved until only one person was required to cross their index and middle fingers
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