The Susan B. Anthony dollar.
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The pentagon.
A confederation
The US 10 cent coin has president Roosevelt.
A US "penny" is actually a 1 cent coin, worth 1/100 of a dollar. A British penny (the coin's official name) is worth 1/100 of a pound sterling.
There are no square nickels. All US nickels are round, and Canadian nickels are either round or dodecagonal (12-sided). Please check your coin again and post a new, separate question with its date and country of origin.