Zi Collection, Page Position: Upper, Radical: Tree (mù), Page 410, Entry 04 "Guangyun" and "Jiyun" have the pronunciation cù, from the rhyme sound qiān mù. Lù lú, meaning a rough, uneven stone ground. Also, "Jiyun" has the pronunciation zhuó, from the rhyme sound shì jiǎo. The meaning is the same. Also, "Zhengzitong" suggests it can be used interchangeably with "zú". Li He's "Huangjiadong Shi" reads: Què bù cù shā shēng cù cù, sì chǐ jiǎo gōng qīng shí lú. Annotation: "Hanshu" records: Yìlóu country, bows are four feet long, arrowheads are made of green stone. Because arrowheads were made of stone, they were commonly written as lú.