I believed it's talismanic script. In the four smaller rounds from the top are the names of guarding angels - Jibril (Gabrael), Mikael (Michael), Israfiel and Israel. While 10 smaller rounds below them are names of major prophets - Adam, Noah, Abraham, Joseph, David, Jacob, Ishmael, Isaac, Jesus and Muhamad. I would tend to associate this talismanic script with Syiah as the picture of the mosque is typically a Shiah shrine / mosque.
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