Au/Aw is for the Awesome Auk

Au is for Auk and the way these two are coming together they are almost forming a capital "A."

John James Audubon [Public domain], via Wikimedia Commons.

 

Once I flip this picture in the opposite direction at home on my Mac it will look like an small "a" facing in the right direction.

 By Archibald Thorburn (d. 1936) [Public domain], via Wikimedia Commons