What does the A.A. in A. A. Milne stand for?

The A.A. in A. A. Milne stands for Alan Alexander.

Milne is best known as the author of Winnie-the-Pooh (1926) and The House at Pooh Corner (1928).

Who wrote, “Oh what a tangled web we weave when first we practice to deceive”? Sir Walter Scott (1771-1832) wrote, "Oh what a tangled web we weave when first we practice to deceive", not Shakespeare.
What was the name of “The Celebrated Jumping Frog of Calaveras County”? The animal in the 1865 Mark Twain story "The Celebrated Jumping Frog of Calaveras County" is named Dan'l Webster.
In James M. Barrie’s play Peter Pan (1904), how did Captain Hook lose his hand? A crocodile ate Captain Hook's hand, then followed him around the seas in search of more of him in James M. Barrie's play Peter Pan.
How were critics Carl and Mark Van Doren related? Critics Carl and Mark Van Doren related were brothers. Both were members of the faculty of Columbia University, Carl from 1911 to 1930, Mark from 1920 to 1959.
What are the five most frequently used letters of the alphabet? In order of frequency of use, they are: e, t, o, a, and n. Which letters are least frequently used? They are: k, j, x, z, and q.
How long is a fortnight? A fortnight is fourteen days.