The word "型号" is formed by combining two independent characters, each contributing a core meaning to create a new, unified concept. The first character, "型" (xíng), fundamentally means "mold", "model", or "type", conveying the idea of a standard form or pattern. The second character, "号" (hào), primarily means "number", "designation", or "mark", used for identifying or labeling. When merged, they semantically blend to express the specific "model designation" or "type number" of a product, where "型" defines the general category or form and "号" specifies its unique identifying mark within that category.