This specific tool is widely available from automotive and tool retailers:
1/2" drive, Torx T55 profile, 100mm total length. 121955
The phrase "" does not appear to be a standard technical name for this tool. However, in the context of hardware and construction, it often describes: This specific tool is widely available from automotive
Tools like the 121955 are "deep" or "long" (100mm) to reach recessed bolts. Torx T55 profile