The Board S.
Follow my board and I will invite to you to add your own S pictures! You can find many famous places people can see the S symbol, as you have seen before. But you will find many others who will be surprises for you. I ask them to upload photos of the mark when they find it, you will be surprised how many symbols will be found today!
Some believe that S symbol gives clues about the identity Straka, I do not know and its very easy to upset people to guess, I post photos for people to deciding.