EIA3216 package. What is it?
The EIA 3216 is referring to a form factor. For example here are some form factors shown on the Wikipedia page about surface mount components:


EIA 3216-10: 3.2 mm × 1.6 mm × 1.0 mm
EIA 3216-12: 3.2 mm × 1.6 mm × 1.2 mm
EIA 3216-18: 3.2 mm × 1.6 mm × 1.8 mm


EIA stands for Electronic Industries Alliance, and is a group that develops standards for the electronics manufacturing industry.