Å.U. Å.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),

gold (chemical element; Latin, aurum).

A.U. or a.u.,

astronomical unit.

A.U., A.u., a.u., Å.U. Å.u., or å.u.,

angstrom unit.