This is a stack of US dollar bills, which can also be called "United States of America" banknotes. It should be noted that different systems are different in the design of the expression, which is reflected in the inconsistency of the shades of green tones and the details of the banknote design. In addition, the Facebook system displayed a red torch of the "Statue of Liberty" on the emoticon. Therefore, the emoji is generally used to specifically refer to dollars and money.
