The Tài Xuán Jīng symbols are, however. A subset can be used like:

𝌆𝌇𝌉𝌊𝌏𝌐𝌒𝌓𝌡𝌢𝌤𝌥𝌪𝌫𝌭𝌮

So Unicode has Bagua (3 bits), Tài Xuán Jīng (4 trits), and I Ching (6 bits, but incomplete).