Wait I got my facts a bit wrong. the ƀ is not associated with the baht. but the overall point remains:
We use ƀ until Unicode adds a "b" with vertical bar, like it did for ₿
It also has the advantage of being in the available unicode set on most machines (because it's a symbol for the Thai Baht, which curiously is divided into 100 "satang"...)
The original ₿ started off as an appropriation of the ฿ until a proposal was accepted to add ₿ to unicode: https://en.wikipedia.org/wiki/Thai_baht#Bitcoin
So we'd just be repeating this process for the lowercase for sats :)
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