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I would suggest googling "$1BB". They're both rather commonly used.

That being said, MM is more necessary because "M" also denotes 1000, and can thus be ambiguous.

Interesting. Just to clarify why I asked, I googled "MM millions" and saw the answer right away but a search for "BB billions" came up rather empty (I read the first result and skimmed the title and snippet for the first page). "1BB" came up with bed and breakfast results. "$1BB" did have some results, though some were like me that this was the first time seeing it and they were asking about it. The other sites are blogs and nothing like Bloomberg.

Anyway, thanks, next time I see it, I guess I will not be confused.

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