My niece lives in the east end of London and on a cold winter’s day a couple of years ago we explored the street art around Shoreditch. The range of art is tremendous, some loud and in your face, others more subtle. I’m not sure who this was by, or what its meaning was, but it draws your gaze in to the letters and symbols.
They appear to be mainly inverted modern English alphabet, which is a Latin alphabet. There are some other letters or symbols too I can’t identify.