What do the symbols on the back of the dollar bill mean?

The national motto "In God We Trust" was added to the dollar bill in 1957.
The Great Seal was added in 1935.
"Annuit Coeptis" mean "He (God) has smiled on our undertakings."
"Novus Ordo Seclorum" means "A new order for the ages."
The pyramid is a symbol of strength and permanence.
The eye represents an all-seeing deity.
1776 refers to the date of the Declaration of Independence.

Source: 

The Comprehensive Catalog of U.S. Paper Money

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