SoText2(3) on Linux
The text e9b0402683e3, as Debian 8 (Jessie) shipped it.
The SoText2 class is a node type for visualizing 2D text aligned with the camera plane. SoText2 text is not scaled according to the distance from the camera, and is not influenced by rotation or scaling as 3D primitives are. If these are properties that you want the text to have, you should instead use an SoText3 or SoAsciiText node.