Guangyun (Guangyun) uses the character "ji" for pronunciation. Jiyun (Jiyun), Yunhui (Yunhui), and Zhengyun (Zhengyun) use the characters "bì" and "jí" for pronunciation, with the same pronunciation as "bì". Shuowen Jiezi (Shuowen Jiezi) explains it as: to stop walking. Another explanation is the name of a sacrifice performed on the stove. Boya (Boya) explains it as: to stop. Yupian (Yupian) states that this character is the same as "bì". Zhou Li - Qiu Guan - Da Si (Zhou Li - Qiu Guan - Da Si) records: When the state has important affairs, it dispatches its subordinates to clear the roads and enforce martial law. Shí Wén (Shí Wén) mentions: The character "bì" is also written as "bì" in some editions. Shiji - Liang Xiaowang Shijia (Shiji - Liang Xiaowang Shijia) records: When going out, it is called "bì"; when entering, it is called "jǐng".