Code completion in completionvalues1.xml for 17[^sp]:
17dp : Density-independent Pixels - an abstract unit that is based on the physical density of the screen.
17sp : Scale-independent Pixels - this is like the dp unit, but it is also scaled by the user's font size preference.
17pt : Points - 1/72 of an inch based on the physical size of the screen.
17mm : Millimeters - based on the physical size of the screen.
17in : Inches - based on the physical size of the screen.
17px : Pixels - corresponds to actual pixels on the screen. Not recommended.