The number thirteen, symbolizing the 13 original colonies (13 stripes on the flag), shows up over and again:
 
  * 13 stars above the eagle
  * 13 steps on the Pyramid
  * 13 letters in ANNUIT COEPTIS
  * 13 letters in E PLURIBUS UNUM
  * 13 bars on that shield
  * 13 leaves on the olive branch
  * 13 fruits
  * 13 arrows
The Great Seal of the United States.

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