Is dp the same as dip? [duplicate]

Possible Duplicate:
Difference of px, dp, dip and sp in android

I've found several topics on this. But none really answers my question.

Dp and dip in android. What is the difference? Is it the same thing?

Yes, they are the same. There is no difference, its just an alias.

Documentation:

The compiler accepts both "dip" and "dp", though "dp" is more consistent with "sp".

dp Density-independent Pixels - an abstract unit that is based on the physical density of the screen. These units are relative to a 160 dpi screen, so one dp is one pixel on a 160 dpi screen. The ratio of dp-to-pixel will change with the screen density, but not necessarily in direct proportion. Note: The compiler accepts both "dip" and "dp", though "dp" is more consistent with "sp".

What is the difference between "px", "dp", "dip" and "sp" on Android?