SoLazyElement(3) on Linux
The text 6b0f06e4e23a, as Debian 7 (Wheezy) shipped it.
The SoLazyElement class is used to handle material and shape properties. So[GL]LazyElement is, as the name implies, an element that is lazy about sending things to OpenGL. The changes are not sent to OpenGL until SoGLLazyElement::send() is called. This means that you can change the state of certain attributes several times, but the state will only be sent to OpenGL once.