The symbol issue goes almost back to the start of bitcoin itself. In February of 2010, bitcoin inventor Satoshi Nakamoto proposed adopting the current symbol as the early stages of the project were coming together. “How does everyone feel about the B symbol with the two lines through the outside?” he wrote. “Can we live with that as our logo?”
Without a Unicode symbol for bitcoin, many users have adopted existing symbols that closely resemble the official logo, such as the symbol for the Thai Baht (฿) and an existing but unused variation on “B” with a horizontal lower stroke (Ƀ). Several months ago, it was thought that Unicode might include the bitcoin symbol in its new 7.0.0 release, but that addition never materialized.
The Bitcoin Foundation Standards Committee will create a formal bitcoin symbol for Unicode, and advocating for its inclusion in coming updates. The committee will also address some lingering issues about how fractional denominations are referred to (μBTC, mBTC, satoshi), and may push for the adoption of ISO-compliant XBT unit references rather than the current BTC. The volunteer committee may also tackle other standardization issues as needed.