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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 Typesetters should make sure to that they use the font version of Symbola (10.24, January 2018) that is free ‘free for any use. Here are the links for the foint file: hintedSymbola.ttf and the Symbola manualuse’, and also to pick the hinted version of the font. The v. 10.24 Symbola font package can be found on archive.org: Symbola.zip on web.archive.org.
Type specifications
Brill 11 pt: ~ Symbola 10 pt
Brill 10 pt: ~ Symbola 10 pt
Brill 9 pt: ~ Symbola 8½ pt