This .NET class wraps the AcBrMeshEntity ObjectARX class. 

The MeshEntity class is the interface base class for mesh objects and subobjects. This class defines the functions that are common to all mesh objects and subobjects, and cannot be instantiated as it has no meaning on its own. It is derived from RXObject in order to provide full service run-time type-checking for all derived mesh classes.

Autodesk.AutoCAD.BoundaryRepresentation.MeshEntity
    Autodesk.AutoCAD.BoundaryRepresentation.Element
    Autodesk.AutoCAD.BoundaryRepresentation.Mesh
    Autodesk.AutoCAD.BoundaryRepresentation.Node

Public abstract Class MeshEntity
Inherits RXObject

public abstract class MeshEntity : RXObject;

Mesh, Node