The standard allowance, an “assigned amount unit” (AAU), is equivalent to one metric ton of carbon dioxide emissions. […] In general, these credits can be purchased, sold, and otherwise transferred by private actors through international markets. Unlike AAUs, they are not allocated by a state but rather are generated through voluntary activities undertaken most commonly by private actors. 2014, John G Sprankling, “Rights in Airspace and Outer Space”, in The International Law of Property, Oxford University Press, →ISBN, page 174:
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AAUs
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(US, abbreviation, alt-of, initialism) Initialism of Amateur Athletic Union.
[…] the AAU […] had not only refused to unsanction the meet but was also said to be contributing funds to bring in foreign competitors […] 2003, Douglas Hartmann, Race, Culture, and the Revolt of the Black Athlete, page 103: