The word "纸张" (zhǐzhāng) is formed through a common Chinese morphological process where the core noun "纸" (zhǐ), meaning "paper," is combined with its associated **measure word or classifier** "张" (zhāng), which is used for flat objects like paper, sheets, or tables. This combination creates a **collective or generic noun** that refers to paper as a material or category in a more abstract and formal sense, rather than a single sheet. It effectively means "paper (as a substance/commodity)" and exemplifies how Chinese can use measure words to derive new, more conceptual nouns from basic ones.