Quick Selection: Selects a contiguous series of facets based on the setting in the UV Mapping Options.
Create Segment by Selection: Creates a segment based on the currently selected facets.
Auto Segmentation: Automatically composites a set of segments for all facets of the selected 3D object.
Explode Segements: Explode the currently selected facets back into facets.
Unwrap Segments: Unwrap the selected segments into 2D Parts.