The popular ticker name ‘BTC’ violates ISO 4217, and as according to this standard, it goes against the currency of Bhutan. According to ISO 4217, which defines rules for national currencies and their nomenclatures and also non-government-backed assets such as Gold (XAU) and Silver (XAG), the first 2 letters of the 3 letter character should denote the country code and the last letter should denote the initial letter of the national currency… So “BTC” conflicts with Bhutan’s currency which is BTN (Bhutanese Ngultrum). That’s why some use the alternative ticker name “XBT."