In the US, coins have nicknames.
Of course you can call them one cent, 5 cents, 10 cents, 25 cents and everybody's going to know what you mean but... e se te perguntam Got a dime?
Pois é, então, para não ficar boiando na hora de pegar as moedas, e para não te lograrem, vamos dar nomes aos bois.
1 cent: penny
5 cents: nickel
25 cents: quarter
50 cent (as far as I know this one doesn't have a nickname)
There's currently no US$1.00 being used coin in the USA, but there used to be.
They're called silver dollars, and some people even collect them.