2.1.4 ObjectPool Storage
The Object Pool storage contains storages for embedded OLE objects. This storage need not be present if there are no embedded OLE objects in the document.
The names of these storages are formed by locating the field of an OLE object by field type (2.9.90 flt) or CP (character position), following (2.4.6.2 Direct Character Formatting) to retrieve the sprmCPicLocation property (2.6.1 Character Properties) for the field separator character (0x14) (2.8.25 Plcfld), converting that value to a string and prepending an underscore "_".