If I may, "A" came from a comic book idea about the everyday life of an amateur author, who publishes his work on the web. He was also to be the mascot of an amateur webzine but which did not hold up.
And why the letter A? Because when I was looking for a name for my character, I was faced with the problem of wanting to make this character the representative of ... almost, all types of amateur content creators. And this whatever the sex. Suddenly, I thought of having two characters, instead of one. A man and a woman, who would form a duo of authors.
But what could their pen name be? I had in the idea of using the X and Y chromosomes, but it would be a little too specific, and especially not original at all.
And in the end, I don't remember why, but I thought about the letters of the alphabet, and the expression: "from A to Z". This made me think of the word "author" which in my language begins with the letters "A", whether it is written in the feminine or the masculine. So I ended up adopting the nickname, of A. The signed in front is just a reference to the signature at the end of a letter or at the beginning of an article, etc. My nickname itself is A.
P.S. : Later ... well, not long ago, I discovered that my nickname was even brighter and more meaningful than I thought. Because not only does the word "author" begin with the letter "A", but the words: Amateur and Artist, too.