Based on another question recently asked, this package is very common, used in high current LED applications (0.5W ~ 3W). The package includes the led chip, lens, heatsinking, but can vary in light radiation patterns. Very common, they have been around for years if not decade. But I have never found a common package name, unlike other led types (5mm, 3mm, Straw Hat, 1206, 0805, etc). Is there a common name, or even a JEDEC or similar standard to standardize this type of package?
The package is called by different trade names by companies,
Lumileds Corp calls them "Barracuda",
while
Osram Opto. calls them "Dragon".
The important feature of the package is a heat-conducting metal center, the "heatsink slug", that can be soldered onto a larger heatsink below:
For details and source, see the chapter on LED packaging of the somewhat-retired LED-related website Light-Emitting-Diodes-dot-org - (note different domain).
See the bottom-left image: Chapter 11: Packaging - Fig 11.5.
A possible reason for not having a clear type code for this package could be that it was not actually a LED package, but just a more generic heatsink-with-extra-plastic-lens.
They are usually referred to as "2-SMD, Gull Wing". I haven't seen a standard refer to this type of package.
"Gull wing" actually refers to the shape of the leads. It is a general term that applies to almost all smt packages that have leads bent towards the outside of the pack, such as QFP.
