A.U.

A.U.
angstrom unit.
Also, a.u.

* * *

au «oh»,
French. to the; in the; with the. It is a contraction of à le, masculine form of à la, occurring in some phrases frequently used in English, as au courant, au revoir.
Au (no period),
A.U. or a.u.,
astronomical unit.
A.U., A.u., a.u., Å.U. Å.u., or å.u.,
angstrom unit.

Useful english dictionary. 2012.

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