RE: Glossary/Acronym List (was: SG2- Like it?)

Speaking of acronyms, 
Does anyone know what a PNG is (see
http://peninsula.starway.net.au/~epowles/oucatalogue.html top figure on
right).

Is this a typo for FNG?
Politically correct FNG? Pretty-New Guy? Private New Guy?
Projected Needle Gun?

Something else?

-----
Brian Bell