How many zeros are in 1 billion in Australia?

Australia and almost all English-speaking countries use the term "billion" to mean 1 x 109, with 9 zeroes. This is on the "short scale" where number names are added by thousands, i.e. a billion is a thousand million.

The "long scale" used in other countries, especially in Europe and Latin America, adds number names by millions, so that a billion is a million million, or 1 x 1012, with 12 zeroes.