The best replacement for pixels is dpi.

The best alternatives to pixels are rated as following:
★★★★★  dpi
★★★★  inches
★★★★  points
★★  resolution
★★  ems
★  print size
★  megapixels
★  1080 pixels
★  picas
★  em
★  dots per inch
★  percentages
★  percentage css
★  sensor size
★  vectors
★  kb
  points ios
  bytes
  dots
  megabytes
  file size
  19.5 kb
  inch
  720 pixels
  dead pixels
  effective pixels
  anamorphic
  centimeters

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Google Trends

Scale is based on the average worldwide traffic of pixels in all years. Click on graph for more.
pixels
dpi
inches