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A very useful symbol font was put together by George Douros: Symbola. This font contains a plethora of symbols from various cultures, among which are not only the Yi Jing hexagrams but also the symbols found in Tài Xuán Jīng. Please make sure to use the font version of Symbola (10.24, January 2018) that is free for any use. Here are the links for the foint font file: hintedSymbola.ttf and the Symbola manual.
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