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A grana knife

A Parmesan knife or grana knife (Italian: tagliagrana) is a knife with a drop-shaped blade and a round wooden handle used to break hard cheeses like grana or parmigiano into shards.[1] Bigger knives with a flat handle that can be hammered are used to cut open the cheese wheels, whose crusts are rather hard.

It is depicted in the official logo of PDO parmigiano reggiano.