Upper case alpha of the extended Latin alphabet. The character was derived from Greek lower case alpha, but this is not a Greek letter. See also w:Latin alpha.
For the lower case, see File:Latin lowercase alpha.svg.
In Unicode, Latin alpha and Latin script a are mapped in a same code. For the Latin script a, see File:Latin uppercase script a.svg.

For the image which includes both the upper case and the lower case letters, see File:Latin alpha in GACL.svg. Note: The letter in this image was copied from File:Latin alpha in GACL.svg.
Own work
Yes0song