What does B mean?

B means Billion.

In American English, a billion means thousand million.
1,000 x 1,000,000 = 1,000,000,000 or 10 ⁹.

In British English, a billion means a million million.
1,000,000 x 1,000,000 = 1000,000,000,000 or 10 ¹².

Now a days, a billion means a thousand million (1,000,000,000 or 10⁹) in both varieties of English.

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