Seal of the president of the United States

The seal of the president of the United States is used to mark correspondence from the president of the United States to the U.S. Congress. It is also used as a symbol of the presidency itself. The central design, based on the Great Seal of the United States, is the official coat of arms of the U.S. presidency. It is also appears on the presidential flag. (TimesSelection subscription required)

 References 

 Other websites 

  on United States Army Institute of Heraldry
 U.S. Presidential Flag page on  Flags of the World

Seal
Category:Symbols of the United States