Letters on Items with Sting MH

What do those letters and numbers indicate? Why is it always different? Some items show [20] [Q45] (A28) another item show things like ($1000) (ilvl after cubing 34) (alvl13) (ilvl after crafting 12)
where $ is surely the sellvalue the other are just messy.

[Q34] is not quantity
Item 6 sometimes indicates Sockets but Item 25 dont have Sockets at all.

Someone got any clues?

 

items have different kinds of levels (alvl,qlvl,ilvl). you can pretty much ignore it unless you are crafting(ilvl) . $1000 is probably the selling price at the vendor. ilvl after cubing means if you cube the item the ilvl is going to be x.