The Greeks gave us a fancy word for the aversion to the number 13: triskaidekaphobia, a combination of tris, meaning "three", kai, which means "and" deca, their word for "ten" and phobia for "fear". In other words, three-and-ten-fear. There are 13 major joints in your body. A deck of cards includes 13 clubs, 13 spades, 13 hearts, and 13 diamonds. The Chinese abacus consists of 13 columns of beads.There are 13 lunar cycles in a solar year and the moon travels 13 degrees across the sky everyday. The United States has a flag with thirteen stripes on it. On the back of the dollar bill, the eagle holds thirteen arrows in one talon and an olive branch with thirteen leaves in the other. Above its head are 13 stars and it bears a shield with thirteen stripes. On the left side, above the pyramids, is the motto, Annuit Coeptis (God Has Favored Our Undertakings), which has thirteen letters. Today is the 13th...today is my birthday.