SbName(3) on Linux
The text 24dd8751ab46, as Debian 4.0 (Etch) shipped it.
The SbName class stores strings by reference in a hash table. The class is used by inventor for keywords and other unique names that are used all over the place and would waste tons of memory if they were duplicated for each reference. Because strings are uniquely identified by their reference, string comparisons for SbName objects are very efficient.