The term 'Test of One's Metal' can be summarized as an ASSAY, which is a five-letter word. An ASSAY is a process of testing or analyzing a material to determine its composition or quality. It is commonly used in the fields of metallurgy and chemistry to analyze the purity of a metal or other substance. In this context, the term 'Test of One's Metal' refers to a test of one's strength, courage, or character.