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double X

From Wiktionary, the free dictionary

FromX, theRoman numeral representing 10.

doubleX (pluraldouble Xs)

(US, slang, dated)Twentydollars; a $20bill.
- 1916,Jack Lait, “The Canada Kid” (chapter 9), inBeef, Iron and Wine, New York, N.Y.:Doubleday, Page & Company,pages178–179:
  “Hikes aroun’ wit’ a hundre’ an’ ninety bucks in ’is kick an’ won’t loosen adouble X fer an ol’ frien’ what’s up again’ it? Why, dat guy ain’t got de firs’ idee about bein’ square wit’ a pal or librul wit’ an ol’ friend in de same line. An’—”