It is a popular name for the Tetra Brik® brand of disposable cartons, used primarily for liquids. 'Tetra' is for 964; 949; 964; 961; 945; (tetra "four") in Greek since previously the Tetra Pak company manufactured tetrahedron-shaped containers (with four triangular faces), to then improve the design and give it a cube or brick shape, which is written brick in English and for the brand was simplified into 'brik'.
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