| style="width:150px;" | [[Glossary of EM.Cube's Materials, Sources, Devices & Other Physical Object Types#Huygens Source |Huygens Source]]
| style="width:250px;" | Used for modeling equivalent sources imported from other [[EM.Cube]] modules
| style="width:200px;" | None (stand-alone source)| style="width:200px;" | Surface of a cube enclosing the physical structure
| style="width:200px;" | Imported from a Huygens surface data file
|}