This .NET class wraps the AcGiDrawable ObjectARX class. 

All graphical objects, both transient and persistent, will implement a drawable interface. Objects exposing this interface are capable of drawing themselves through the Draw API. 

All displayable objects are derived from Drawable (which is referred to throughout as a "drawable"). This class implements the protocol by which objects can be queried by the graphics system (GS) for their geometry, attributes, cache pointers, and database IDs. 

A drawable need not have displayable output. Some drawables only affect attributes, transformations, or clipping regions; others contain other drawables and have no geometry or attributes of their own. AutoCAD’s LayerTableRecord and BlockTableRecord classes are examples of such drawables. 

A drawable need not be a database object. Two examples of non-persistent drawables are the UCS Icon and the Grid. These are visual elements of the AutoCAD editor that do not belong to an database.

Autodesk.AutoCAD.GraphicsInterface.Drawable
    Autodesk.AutoCAD.GraphicsInterface.Glyph

Public abstract Class Drawable
Inherits RXObject

public abstract class Drawable : RXObject;

RXObject