By far the most commonly used symbol for Bitcoin is BTC, a capital letter B with two falling strokes at the top and bottom. This symbol was designed by Satoshi Nakamoto for the icon of an early version of the original Bitcoin client, though the very first versions of the Bitcoin client used "BC" instead of any special symbol. Presumably the symbol was intended to look similar to other currency symbols. The symbol represents the currency unit "bitcoin" (100 million satoshi), as well as the Bitcoin network and currency itself. The bitcoin currency unit is also commonly given the informal currency code BTC.
The Bitcoin sign is part of Unicode 10.0 (released June 2017) with code point U+20BF (₿). As of June 2017, font support for the Bitcoin sign is in macOS Sierra, iOS, Android O beta, Windows 10 Creators Update and several Linux releases. After being rejected in 2011, the Bitcoin sign was accepted for Unicode in November 2015 and first appeared in Unicode 10.0 in 2017.
Historically, similar looking Unicode symbols such as the Thai Baht (฿) have been used because the Unicode standard at the time had not included a symbol for Bitcoin. The capital letter B with stroke (Ƀ) was also used in contexts where it was likely that using the Baht symbol would cause confusion.
อ้างอิง https://en.bitcoin.it/wiki/Bitcoin_symbol , https://th.wikipedia.org/wiki/%E0%B8%9A%E0%B8%B4%E0%B8%95%E0%B8%84%E0%B8%AD%E0%B8%A2%E0%B8%99%E0%B9%8C
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