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* dpi

dots per inch.

  http://en.wikipedia.org/wiki/Dots_per_inch

* ppi

pixels per inch, pixel density.

 Inch  Resolution  ppi
  17"   1280x1024   96
  19"   1280x1024   86
  19"   1600x1200  105
  21"   1600x1200   95
   2"    240x320   196

  http://en.wikipedia.org/wiki/Pixels_per_inch

* lpi

lines per inch.

  http://en.wikipedia.org/wiki/Lines_per_inch

* bpp

bits per pixel, color depth.

 * 1 bpp, 2 colors (monochrome)
 * 2 bpp, 4 colors
 * 3 bpp, 8 colors
 * 8 bpp, 256 colors
 * 16 bpp, 65,536 colors ("Highcolor" )
 * 24 bpp, 16.8 million colors ("Truecolor")

  http://en.wikipedia.org/wiki/Color_depth

* Display resolution.

  Name   Megapixels   Width x Height
  CGA     0.064         320×200
  EGA     0.224         640×350
  VGA     0.3           640×480
  SVGA    0.5           800×600
  XGA     0.8          1024×768
  SXGA    1.3         1280×1024
  UXGA    1.9         1600×1200
  WUXGA   2.3         1920×1200