When I was a younger kid than I am now, I used to think I was hot shit. (Still do, prob’ly.) I devised a symbol for myself that combined the letters "A" and "M." (It consisted of a capital "A" with an inverted triangle under the cross-bar, making an "M" out of the lower half.) I used it as my signature for a little while on homeworks until Mrs. Klotz told me that it wasn’t serving it’s purpose since she didn’t know what it meant.
The shadow on the left kind of looks like the symbol. Here it is in Times New Roman: