Selection

Subobject selection rollup contains several functions. All of them related to selections.
Loop¶
Same as the normal loop, except that this stops when it reaches the end of a UV shell.
Ring¶
Same as the normal ring, except that this stops when it reaches the end of a UV shell.
Select by Smoothing Groups¶
Select edges based on the smoothing group borders.
Select by Material ID¶
Select edges based on the border of different material ids.
Select by Seams¶
Select edges that are seams
Select by No Seams¶
This one selecs all of the UV shells that has no border and seams at all. (completely closed)
Select Flipped Faces¶
Selects all of the faces that are flipped
Select Edges By Angle¶
Selects those edges that has a bigger face angle than the given angle.
Note
Relative to perpendicular edges. (If perpendicular, then it's 0 degree)