SbVec4f(3) on Linux
The text 3f17d544fc4e, as Debian 8 (Jessie) shipped it.
The SbVec4f class is a 4 dimensional vector with floating point coordinates. This vector class is used by many other classes in Coin. It provides storage for a 3 dimensional homogeneoues vector (with the 4 components usually referred to as <x, y, z, w>) aswell as simple floating point arithmetic operations.