Select Surfaces toolbar
SelClosedSrf
Select all closed surfaces.
SelOpenSrf
Select all open surfaces.
SelPicture
Select all objects created with the Picture command.
SelPlanarSrf
Select all planar surfaces.
SelSrf
Select all surfaces.
SelTrimmedSrf
Select all trimmed surfaces.
SelUntrimmedSrf
Select all untrimmed surfaces.
SelVisible
Select all surfaces or meshes that are in front of other objects with a crossing selection.