Byr
From Wikipedia, the free encyclopedia
Byr was often used in geology and astronomy as a unit of one billion years. The "b" is an abbreviation for "billion" (meaning thousand million), with "yr" simply an abbreviation for "year". Today, the International System of Units specifies Ga, but Gy or Gyr are sometimes used. Because a billion means 1000 million in the U.S. but can mean a million million in Great Britain, and in many non-English speaking countries, its use is discouraged.
[edit] See also
 |
This standards- or measurement-related article is a stub. You can help Wikipedia by expanding it. |
