It is either b or bn.
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1 bn.
The value 1 billion regardless of whether it is 1 billion in the US, UK or Canada is always: 1,000,000,000
10 B is not an abbreviation of 1 billion. 1,000,000,000 can be abbreviated as 109.
1000000 = one million 1000000000 = one US billion 1000000000000 = one UK billion So one million is 1000 US billion, and 1000000 UK billion, although common practice in the UK nowadays is to use the US definition.
In the US, 15.2 billion is 15,200,000,000. In the UK, 15.2 billion is 15,200,000,000,000.