以苍璧礼天以黄琮礼地以法器礼人“琮”始见于《周礼》等古籍。其形以《周礼·考工记·玉人》所释:“大琮十有二寸,射四寸,厚寸。”《白虎通·文质篇》曰:“圆中牙身玄外曰琮。”郑玄补注《周礼》时说:“琮,八方象地。”南唐徐锴释琮时讲:“状若八角而中圆。”后人因难辨琮状的实体,以致南宋时称为“镇圭”。至清乾隆,按东汉许慎《说文解字》,以“琮,瑞玉,大八寸,似车”的说法为据,直呼“琮”为“辋头、杠头笔筒”等, To Cang Bi Li day to yellow ceremonial gift to the courtesy “琮 ” began to see the “Zhou Li” and other ancient books. Its shape to “Zhou Keji Kee jade” release: “big bustard ten inches, shoot four inches, thick inch.” “Bai Hu Tong quality articles” said: “round teeth Body Xuan said 琮. ”“ Zheng Xuan, ”said Zhou:“ 琮, P Plus. ”Southern Tang Xu 锴 release 琮 when:“ If the star anise and round. ” Slightly shaped body, resulting in the Southern Song Dynasty called “town Kyu”. To the Qing Emperor Qianlong, according to the Eastern Han Dynasty Xu Shen “Explain Word” to “琮, Ruiyu, eight inches, like the car ” is based on the statement, “琮 ” as Head pen holder "and so on,