Packing refers to the way the product is packaged.

(retail box) - retail box, just like the store.
(mini retail box) - smaller size retail box, about the size of a dvd box.
(DVD style box) - DVD box just like a DVD movie comes in. DVD boxes are especially popular in the United Kingdom. The CD is NOT a DVD type disc unless it is specifically stated. It is normal CD-ROM.
(brown box) - this comes in a plain brown box. Same program and manuals that you would get in full retail box.
(AE) - Academic box. Academic product is typically meant to be sold to school and universities and is not meant to be sold for business use. For educational use only.
(jc) - Jewel Case - includes color cover.
(jc, nc) - Jewel Case, no cover.
(jb) - Jewel Case with separate book.
(sl) - cd in a sleeve, no cover.