This .NET class wraps the AcDbSymbolTable ObjectARX class. 

SymbolTable is the base class for all of the classes used to export AutoCAD's built-in symbol tables. 

Autodesk.AutoCAD.DatabaseServices.DBObject
    Autodesk.AutoCAD.DatabaseServices.SymbolTable
        Autodesk.AutoCAD.DatabaseServices.AbstractViewTable
        Autodesk.AutoCAD.DatabaseServices.BlockTable
        Autodesk.AutoCAD.DatabaseServices.DimStyleTable
        Autodesk.AutoCAD.DatabaseServices.LayerTable
        Autodesk.AutoCAD.DatabaseServices.LinetypeTable
        Autodesk.AutoCAD.DatabaseServices.RegAppTable
        Autodesk.AutoCAD.DatabaseServices.TextStyleTable
        Autodesk.AutoCAD.DatabaseServices.UcsTable
        Autodesk.AutoCAD.DatabaseServices.ViewportTable
        Autodesk.AutoCAD.DatabaseServices.ViewTable

Public abstract Class SymbolTable
Inherits DBObject
Inherits IEnumerable

public abstract class SymbolTable : DBObject, IEnumerable;