SoIndexedFaceSet(3) on Linux
The text 0426d728fa39, as Debian 6.0 (Squeeze) shipped it.
The SoIndexedFaceSet class is used to handle generic indexed facesets. Faces are specified using the coordIndex field. Each face must be terminated by a negative (-1) index. Coordinates, normals, materials and texture coordinates from the current state (or from the vertexProperty node if set), can be indexed to create triangles, quads or polygons.