Re: New characters query

[Richard Cook]

Another list member mentioned (off-list) the system of 9 bigrams and 81 tetragrams.

These appear in the text of a book called [U+592a][U+7384][U+7d93] 
<Tai Xuan Jing> by [U+63da][U+96c4] Yang Xiong.(c.53BC-c.18AD).

Where the 64 hexagrams are based on a binary system,
the 81 tetragrams are based on a trinary system.

They're much less well-known, a relatively recent innovation, and a much
less influential imitation of <Zhou Yi>.

I don't think anyone is proposing to encode these ... are you?