The basic meaning of "pole" is the top, the highest point and the end point, such as climbing poles and reaching the top. The extended meaning refers to the north and south ends of the earth or the positive and negative ends of circuits and magnets, such as polar regions and polar circles. In daily use, "pole" is often used as an adjective, indicating the highest and final, such as pole and limit.
"Ji" is a simplified word for "_". Oracle Bone Inscriptions in Shang Dynasty and the early bronze inscriptions were like a giant with his head on the ground. Use the sky overhead to indicate the height, which is extremely high. This is the original meaning of "pole". Later, Jin Wen added a "mouth" for talking and shouting and a "branch" for hitting people, meaning "urgency and impatience". In the Han Dynasty, the official script used a straight pen to replace the arc pen and the circle fold of the seal script, and treated the "pole" and "pole" separately. The simplified Chinese characters are now "extreme". The simplified version of the Chinese character "Ji" was originally evolved from Shuowen.