The Thai Baht ฿ was originally used as the Bitcoin symbol until ₿ was added to Unicode.
We can repeat a similar process, temporarily appropriating ƀ until Unicode adds a lowercase b with a vertical stroke.
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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