Full form of Px, Sp, Dp, Dip, Pt, Mm, in dimension.
Dimensions values are defined inside android layout.xml file for example 10sp, 20dp, 100px etc. There are basically six types of dimension are available to develop android applications and each and every dimension represent a unique set of size to define specific area on android mobile screen. So here is the complete step by step tutorial for What is the difference between px sp dp dip in android.