What's the significance with the letter A??

Sorry if this is a newb question, but I've always wondered about the continuous appearance of "the letter A" in the show. I think the first time was during the S4 finale, but I could be wrong. Then you saw Rick's house in Alexandria marked with an A (although that could just stand for "Alexandria" in that case)...but his hand was also marked with an A (and iirc, the camera zoomed in on it like it was significant). Then you have the part where Anne/Jadis is on the walkie saying "I have an A, etc".

I feel like there could be more examples of this but this is all I can remember at the moment. Is there an answer to this? I imagine it's comic-related?

Submitted August 27, 2020 at 10:52PM by King_reggie https://ift.tt/2EB9P5L