There's no abbreviation of Java that isn't weird. These all work well:

perl -> pl

python -> py

rust -> rs

ruby -> rb

javascript > js

But java?

java -> ja? jv? jav?

Clearly Sun should've gone with a different name for the language entirely, I dunno, maybe they could've named it after an oak tree instead:

oak -> ok

Hmm, maybe I could get used to "jv" after all.