Actually many more than three countries have currencies that are called dollars. Just to name a few of the more important ones:
USA
Canada
Even though they're all called "dollars" they're not interchangeable. Each one has a different value and exchange rate on world currency markets - check a site such as xe.com for current conversion factors.
If I was going to be a stickler -and I am-, I would answer that it is the no-longer-used Scandinavian currency called "Daler", which is the currency that led to the name "Dollar". However, Europe still has many different currencies, but I presume the answer you are looking for is the currency called "Euro".
Euro
Decimal currency was introduced in Australia on the 14th of February, 1966. Dollars and cents became the Australian currency on the conversion from Pounds, Shillings and Pence. The new currency was the Australian Dollar consisting of 100 cents. New coins included the 1, 2, 5, 10, 20 and 50 cent coins. New Banknotes included the 1, 2, 10 and 20 Dollar notes. Many countries changed to a decimal system of currency during the 20th century since, as the name suggests, it is based on multiples of ten and is a much simpler and more streamlined system to work with and make mental calculations.
North Africa is a geographical region and not a single country, there is no single currency
spain france england :)
australia,america and new zealand
There are not three countries in Australia. Australia is a continent and an independent country in itself. Its capital is Canberra, and the currency is the Australian dollar.
there is no true name for currency. currency is the type of "money" people use to purchase things for example US currency is called the dollar and England currency is called the pound
There is no such thing as a euro dollar. What you are referring to is the euro, which is the name of a currency used in 17 of Europe's countries.
There are several countries that use "peso" as the name of their currency, and several countries that use "dollar" as the name of their currency. You need to specify which peso and which dollar. For example, 340 Mexican pesos (MXP) is about 26 U.S. dollars (USD) as of June 2014.
There are many different currencies in the world. Some countries share currencies like the euro and some countries have the same name for the currency but they are not the same currency like American dollar and the Canadian dollar. the most popular currencies are dollar, euro, pound, yen, ruble ect.
The currency used in Guyana is the Guyanese Dollar, abbreviated as GYD.
australia dollar
the Canadian dollar
In Belize, The current currency is the Belize Dollar (BZD).
The US (common name) The United States of America (official name) Washington, DC (capital) US Dollar [American Dollar] (currency)
Guyanese dollar (GYD) .