Android Development: dp/dip, ppi/dpi

1 dp/dip (density independent pixel or device independent pixel) = 1/160 inch
or 1 inch = 160 dp

(This is important for app developers and designers.)
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dpi (dots per inch) = ppi (pixels per inch) [physical pixel on device] = pixel density
more dpi = more clarity
Note 5 has 518 dpi or ppi. In other words, Note 5 has 518 physical pixels per inch.

(This is important for phone buyers.)
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formula:

dp = (no. of pixels/pixel density) * 160

smallest width in inches = smallest width in pixels / pixel density
eg. 1440/518 = 2.8 inches ~
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Samsung Galaxy Note5
DisplayType: Super AMOLED capacitive touchscreen, 16M colors
Size: 5.7 inches (~75.9% screen-to-body ratio)
Resolution: 1440 x 2560 pixels (~518 ppi pixel density)
Multitouch: Yes
Protection: Corning Gorilla Glass 4