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Given the whole 'pavement marking' meme was a hoax and most of the symbols were actually put there by the national grid to mark pipes & gas lines, along with the striking resemblance of this symbol to the diagram of an atom in my GCSE science textbook, I'm going to hazard a guess that there's a secret nuclear reactor under the pavement at that spot.
Foreign did you say? here's another one in Pyongyang! Forget the police ask MI5.I did think it was bad but the people who live there are foreign so might make explaining difficult.