Chapter 6 -- ENTITIES Section
The following group codes apply to seqend entities. In addition to the group codes described here, see "Common Group Codes for Entities." For information about abbreviations and formatting used in this table, see "Formatting Conventions in This Reference."Seqend group codes
APP: name of entity that began the sequence. This entity marks the end of vertex (vertex type name) for a polyline, or the end of attribute entities (attrib type name) for an insert entity that has attributes (indicated) by 66 group present and nonzero in insert entity). This code is not saved in a DXF file.