| style="width:200px;" | A rectangular area at the cross section of the host hollow box
| style="width:200px;" | The host box object can have one capped end at most.
|-
| style="width:30px;" | [[File:lumped_src_icon.png]]
| style="width:150px;" | [[Glossary_of_EM.Cube%27s_Materials,_Sources,_Devices_%26_Other_Physical_Object_Types#Lumped Source |Filamentary Current Source]]
| style="width:250px;" | General-purpose point voltage source
| style="width:200px;" | None (stand-alone source)
| style="width:200px;" | A single point
| style="width:200px;" | None
|-
| style="width:30px;" | [[File:plane_wave_icon.png]]