Pigpen Ciphers are a fun encryption puzzle, often adopted by escape rooms. It uses 2 variants of a tic-tac-toe board + 2 variants of an X to represent different letters of the alphabet (see the Cipher Key at the bottom of the app below). There are different variants of the Pigpen Cipher, some that have the X portion go clockwise, others that have it go top-to-bottom, left-to-right (as the example below uses). The symbols were all generated using SVG coordinate codes (which I had to learn in order to fix some of the mistakes that the AI had made in generating the symbols).