The Convertible Peso (CUC), occasionally referred to as "dollar" in spoken language, is one of two official currencies in use in Cuba.
The other is the Peso (CUP), sometimes called the "national peso" or in Spanish moneda nacional.
Cuban state workers receive a portion of their wages in convertible pesos, the rest in national pesos.
Shops selling basics, like fruit and vegetables, generally accept only the normal peso, while "dollar shops" sell the rest.
The word "pesos" may refer to both non-convertible and convertible money.
Cuban convertible pesos are 25 times more valuable, but this does not completely eliminate the confusion for tourists.
Since goods bought in national pesos have controlled prices, tourists are sometimes confused by prices perceived as "too cheap."
There is a three-peso note but there is no two-peso note. Reference: Wikipedia