OLE object type stored with an AcDbOle2Frame (DXF group code 71).
https://help.autodesk.com/cloudhelp/2018/ENU/AutoCAD-DXF/files/GUID-77747CE6-82C6-4452-97ED-4CEEB38BE960.htm
Embedded OLE object
Linked OLE object
Static OLE object
OLE object type stored with an AcDbOle2Frame (DXF group code 71).
See
https://help.autodesk.com/cloudhelp/2018/ENU/AutoCAD-DXF/files/GUID-77747CE6-82C6-4452-97ED-4CEEB38BE960.htm