They say that the number 13 is an unlucky number. This is almost a worldwide belief. You will usually never see a room numbered 13, or any hotels or motels with a 13th floor.
But think about this:
13 original colonies,
13 signers of the Declaration of Independence,
13 stripes on our flag,
13 steps on the Pyramid,
13 letters in the Latin above,
13 letters in "E Pluribus Unum,"
13 stars above the Eagle,
13 bars on that shield,
13 leaves on the olive branch,
13 fruits, and if you look closely, 13 arrows.
And, for minorities: the 13th Amendment.
13 facts about the one dollar bill.