Hi subha,
I don’t know anything about Stomp, although Stomp_GEO is probably the mesh (geometry) that makes up the character.
Euler (Leonhard Euler, mathematician) is the name given to a specific way of describing rotations in 3D:
it consists of three consecutive rotation around the 3 axes in a specific order.
Three numbers are given that represent the three angles, how much to rotate around each axis in the order that is previously decided upon.
For instance: a YZX Euler of 30°, 45°, 60°, will first rotate 30° around the Y-axis, followed by 45° around the Z-axis and finally 60° around the X-axis.
Sounds easy and logically, but there are some problems with this method and there are other ways to describe 3D rotations…
Depending on the situation one might be better of using an other method. (Do not (yet) ask what the other method is!)