bya

This initialism is often used in the sciences of astronomy, geology, and paleontology.

Billion by this convention (109) is often called a "thousand million" in the UK and a "milliard" in some other countries.

[2] For this reason, there is potential for some confusion, and some scientists prefer the unit Gya, while others prefer Ga (Giga-annum), however, bya remains in more widespread use.

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