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X-efficiency is the degree of efficiency maintained by firms under conditions of imperfect competition, for example, in the case of a monopoly. Signature X-mark is put by a person who cannot put a full signature on the document due to illiteracy or disability. The Extensible Business Reporting Language (XBRL) is a freely available global accounting standards framework used to exchange business information. The East Caribbean dollar (XCD) is the official currency of the Organization of Eastern Caribbean States (OECS), replacing the British West Indies dollar in 1965. “XD” appears as a footnote, subscript, superscript, or suffix to the ticker symbol to indicate that the stock is ex-dividend. A xenocurrency is a currency deposited or exchanged on a market outside its country of origin. Xetra is a trading technology platform operated by the Deutsche Börse group. XRT is an extension printed after the stock ticker that indicates that the stock is trading on an ex-rights basis.