SoTexture2(3) on Linux
The text 5eb52c6f5c73, as Debian 6.0 (Squeeze) shipped it.
The SoTexture2 class is used to map a 2D texture onto subsequent geometry in the scenegraph. Shape nodes within the scope of SoTexture2 nodes in the scenegraph (ie below the same SoSeparator and to the righthand side of the SoTexture2) will have the texture applied according to each shape type's individual characteristics. See the documentation of the various shape types (SoFaceSet, SoCube, SoSphere, etc etc) for information about the specifics of how the textures will be applied.