Main Page | See live article | Alphabetical index Aa may be: a type of lava; see Aa (lava). several rivers in Europe; see Aa River. a village in Estonia; see Aa, Estonia. Å, an alternative version, or transcription, of the letter in the Danish and Norwegian alphabets. a plant genus; see Aa (plant) See also AA for usage as an initialism. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.