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||Non-SI abbreviation||Short for...||[SI|[International System of Units]-prefixed equivalent||Comments and examples
|''kyr''|kilo years|ka|* Thousand years
|''myr'' \\ ''Myr''|million years \\ Mega years|Ma|* Million years
|''byr''|billion years|Ga|* Billion years ( [thousand million|https://en.wikipedia.org/wiki/Long_and_short_scales]  years)
|''kya''|kilo years ago|ka ago|* Appearance of ''Homo sapiens'', ''circa'' 200 kya\\* [Out-of-Africa migration|https://en.wikipedia.org/wiki/Out-of-Africa_migration] , ''circa'' 60 kya\\* [Last Glacial Maximum|https://en.wikipedia.org/wiki/Last_Glacial_Maximum] , ''circa'' 20 kya\\* [Neolithic Revolution|https://en.wikipedia.org/wiki/Neolithic_Revolution] , ''circa'' 10 kya
|''mya'' \\ ''Mya''|million years ago \\ Mega years ago|Ma ago|* [Pliocene|https://en.wikipedia.org/wiki/Pliocene] , 5.3 to 2.6 mya\\* The  [last geomagnetic reversal|https://en.wikipedia.org/wiki/Brunhes%E2%80%93Matuyama_reversal]  was 0.78 mya%%sup [[30]/%\\* The ( [Eemian Stage|https://en.wikipedia.org/wiki/Eemian_Stage] )  [Ice Age|https://en.wikipedia.org/wiki/Ice_Age]  started 0.13 mya\\* The  [Holocene|https://en.wikipedia.org/wiki/Holocene]  started 0.01 mya
|''bya'' \\ ''Gya''|billion years ago \\ giga years ago|Ga ago|* oldest  [Eukaryotes|https://en.wikipedia.org/wiki/Eukaryotes] , 2 bya\\* formation of the  [Earth|https://en.wikipedia.org/wiki/Earth] , 4.5 bya\\* [Big Bang|https://en.wikipedia.org/wiki/Big_Bang] , 13.8 bya
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