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Drawables define things which draw pixels on the screen as if rendering a real 3D objetc. Usually Drawables contain PrimitiveSets which contain polygons. These are known as osg::Geometry - this is the main interest of this note.
Drawables can also be stand alone:
Shape Drawable - simple shapes, box, sphere etc. Impostor Sprite Particle System osgText
or you can derive your own class from drawable.
If the drawable is a geometry it will refer to arrays of:
vertices texture coordinates (up to 8 textures on each polygon) normals (for lighting) possibly vertex indices and PrimitiveSets.
These last are among the most complex of osg classes as they can be defined in a large number of ways.