materjali kõvadust iseloomustav näitaja, mis on määratud Vickersi meetodil (vrd Rockwelli kõvadusarv, Brinell kõvadusarv)
a number related to the applied load and surface area of the permanent impression made by square-based pyramidal diamond indenter (compare: Rockwell hardness number, Brinell hardness number)
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