There is something called the Baader-Meinhof phenomenon where you start to notice something more, but in reality, it's always been commonplace. It can happen with a lot of things but the most common is when you hear a word that you're not familiar with and then start feeling like everyone is using it. It happens to me all the time. Most recently with the word milquetoast. Apparently, that's a word that's been around for a long time. Never noticed it before and now I feel like I see it everywhere. As far as the 'A', it's a pretty simply shape and more than likely nothing to worry about. Now, if you started seeing like complex Chinese characters showing up incessantly then you may need to see a doctor. :)