ferna

Etymology
From.

Noun

 * 1) a box-shaped carton (for liquids)
 * 2)  four of a kind

Usage notes
Referring to drink cartons, this word was adopted to distinguish the newer Tetra Brik and Tetra Rex cartons from the original tetrahedral Tetra Pak packaging (now branded Tetra Classic), called, which had previously been the common container format for milk in Iceland.