The packages is called a "heatsink slug", and trade names of **"Barracuda"** (*), by Lumileds Corp, or **"Dragon"** by Osram Opto.

in the chapter on LED packaging of the somewhat-retired LED-related website [Light-Emitting-Diodes-dot-org](http://www.ecse.rpi.edu/~schubert/Light-Emitting-Diodes-dot-org/) - (note different domain).

![led-package-barracuda-lumileds][2]
![enter image description here][1]

See the bottom-left image: [Chapter 11: Packaging - Fig 11.5.](http://www.ecse.rpi.edu/~schubert/Light-Emitting-Diodes-dot-org/chap11/chap11.htm)

*<sub>Barracuda was at least initially, actually referring to the type of LED die itself, not the package.
</sub>


  [1]: https://i.sstatic.net/WCK73.jpg
  [2]: https://i.sstatic.net/OPEuP.png