BHN stands for Brinell hardness number, which is a measure of hardness for materials using an indentation test. There are several synonyms for BHN that are used in different contexts. In the materials testing industry, BHN can be referred to as HBW, which stands for Brinell hardness number (W for tungsten carbide ball). In the metalworking industry, BHN is often referred to as the Rockwell hardness rating or the Vickers hardness rating. The Mohs hardness scale is also used to measure the hardness of minerals, rocks, and gems using a scratch test. Other synonyms for BHN might include hardness rating or material strength, depending on the context of the conversation.