base32 uses 26 letters and 6 digits
you can consider a byte to be base 256 also, variable integers that use a continuation bit are like a compact base 128 encoding
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i mean, keep in mind, you can represent 8 bits as a symbol with a grid of 2x4, that's really not that complicated a set of symbols. also there will be a natural set of symmetries to them, inverses, and mirrors and rotations