ppb, ppm, ppq, ppt, pptr
ppb, ppm, ppq, ppt, pptr : Abbreviations for units of proportion: ppb = part per billion (10-9), ppm = part per million (10-6), ppq = part per quadrillion (10-15), and ppt = part per trillion (10-12), respectively. However, the abbreviation "ppt" is also used sometimes for part per thousand (10-3). To avoid this confusion, "pptr" is an alternate abbreviation for part per trillion
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