Which type of indenter is utilized in determining the Vickers hardness number?

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A rounded spherical indenterAn indentation made by a steel ballAn indenter shaped like a rhomboidA diamond pyramid with a 136-degree angleA conical steel tip

Explanation

The Vickers hardness test employs a diamond-shaped pyramid indenter with an angle of 136 degrees between opposite faces. Other indenters, such as spherical or steel ball types, are used in different hardness tests but not in the Vickers method.