It doesn't have a specific name like those given to Egyptian pyramids. Rather, it's taken from the reverse side of the Great Seal of the United States, and is a symbolic representation of the US' founding:
On a $1 US dollar bill.
The US year of independence is shown at the bottom of the pyramid on the back of the bill.
The design on the back of a US dollar bill that features a pyramid is the reverse of the Great Seal of the United States. It just means the people who designed the dollar bill wanted to feature the reverse of the Great Seal on it (the design in the other circle ... the Eagle ... is the obverse, or front, of the Great Seal). The official symbolism, presented at the time the US Congress approved and adopted the Great Seal, is that the pyramid "represents Strength and Duration."
The "chunky" candy bar and the unfinished pyramid on the back of the US one dollar bill are examples of a trapezoid.
The unfinished pyramid on the back of an American $1 bill represents the country that is always building, always improving and getting better and thus, always slightly unfinished.
Irish people call the US Dollar bill, a dollar or a dollar bill.
The US has never produced a $4 bill, though Canada once had such a denomination.
200
This depends on the country: US: Abraham Lincoln is on the 5 dollar US bill.
Andrew Jackson's picture is on the US twenty dollar bill.
There is no US $2,000 bill.
The Bahamian Dollar is pegged 1:1 with the US Dollar, so a $1 Bahamas bill is worth exactly $1 US Dollar.