[snowpid]

What is L1, L2 Proficiency?

[jgwil2]

L1 is first language, L2 is second, etc. Except for L1, which implies native proficiency, it doesn't say much about the level, just the order in which they are learned.

[snowpid]

I think, the European A1, A2, B1.. is better way for descriping language proficency