Usually means a thousand million. 1,000 x 1,000,000 = 1,000,000,000

Written as a 1 followed by 9 zeros.

Or using scientific notation as: 1 × 10

In some countries such as the UK it could mean a million million 1,000,000 x 1,000,000 = 1,000,000,000,000 (A 1 followed by 12 zeros, or 1 × 10

Written as a 1 followed by 9 zeros.

Or using scientific notation as: 1 × 10

^{9}In some countries such as the UK it could mean a million million 1,000,000 x 1,000,000 = 1,000,000,000,000 (A 1 followed by 12 zeros, or 1 × 10

^{12})See: Trillion