We're using the pigpen cipher (also known as the masonic cipher, Freemason's cipher, Napoleon cipher, and tic-tac-toe cipher), which is believed to be an ancient cipher. The pigpen cipher assigns geometric symbols - representing the fragments of a grid - to the letters of the alphabet.
Notice that they look similar to the shape of the bracket for the "GH" section. This means that the symbol represents one of those letters. How do you know which one? You need something that notes one letter rather than another. The dot inside the shape means the second letter. The same applies to the X-shaped bracket.
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