Tungsten is a chemical element with the chemical symbol "W" and atomic number 74. In industrial and scientific applications, tungsten is often found in different forms and alloys rather than as a pure element. Tungsten alloy has high melting point, high density and good high temperature resistance, so it is widely used in many fields, such as electronics industry, aerospace, medical equipment and so on.

Tungsten-Molybdenum Alloy: For example, Tungsten-Molybdenum alloy can be designated by the designation "TZM", which is an alloy of tungsten, molybdenum, zirconium and titanium, which has good heat resistance and mechanical properties.

Pure tungsten: Pure tungsten materials are usually indicated by "W", but in some contexts, the designation "WP" (such as WP-1, WP-2) may also be used to indicate tungsten materials of different purity.

Tungsten Copper Alloy: This alloy is used in electronic packaging and thermal conductivity applications. Common grades are "CuW" and "WCu", which represent different ratios of tungsten-copper alloys.