Decimal point or comma?

Is it only in English speaking languages that a decimal point is used to separate an integer number from a decimal number? e.g. pi = 3.14159265; $15.22

I see the comma is used elsewhere. e.g. 3,14159265; $15,22

It's not only in English speaking countries. They use a dot for a decimal point in Japan.

http://en.wikipedia.org/wiki/Decimal_point

Dot Countries: Australia, Botswana, Canada (English-speaking), China, Costa Rica, Dominican Republic, El Salvador, Guatemala, Honduras, Hong Kong, India, Ireland, Israel, Japan, Korea (both North and South), Malaysia, Mexico, Nicaragua, New Zealand, Panama, Philippines, Puerto Rico, Saudi Arabia, Singapore, Thailand, United Kingdom, United States

Comma Countries: Albania, Andorra, Argentina, Austria, Belarus, Belgium, Bolivia, Brazil, Bulgaria, Canada (French-speaking), Croatia, Cuba, Chile, Colombia, Czech Republic, Denmark, Ecuador, Estonia, Faroes, Finland, France, Germany, Greece, Greenland, Hungary, Indonesia, Iceland, Italy, Latvia, Lithuania, Luxembourg, Macedonia, Moldova, Netherlands, Norway, Paraguay, Peru, Poland, Portugal, Romania, Russia, Serbia, Slovakia, Slovenia, Spain, South Africa, Sweden, Switzerland, Ukraine, Uruguay, Venezuela, Zimbabwe

Bulgaria is a dot country.