The term 'knife-sharpening tool' is often referred to as a STEEL. STEEL is a metal alloy composed of iron and carbon, and is known for its strength and durability. It is commonly used in the construction of knives, tools, and other items that require sharp edges. A knife-sharpening tool is an item used to sharpen knives, usually made of STEEL. It typically consists of a handle, a blade, and a sharpening stone or wheel. The tool is used to sharpen the blade of a knife by grinding it against the stone or wheel.