Version history:
1.0, 22 January 2018
The Yi Jing symbols are hexagrams (called 卦 guà in Chinese), i.e., they consist of six elements.
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 file: hintedSymbola.ttf and the Symbola manual.
Brill 11 pt: ~ Symbola 10 pt
Brill 10 pt: ~ Symbola 10 pt
Brill 9 pt: ~ Symbola 8½ pt