Explore each form from the oldest known stage to today.
The kanji 璧 is a phono-semantic compound, formed by combining the radical 玉 (jade) with the phonetic component 辟. The character depicts a flat, circular piece of jade with a hole in the center, known as a *bi* disc. The 玉 radical signifies the material and category of the object, classifying it among precious stones and jade artifacts. The 辟 component primarily provides phonetic value (its Old Chinese pronunciation was likely similar to *bek), but it may also carry a semantic connotation of "round" or "encircling," reinforcing the disc's circular form. Historically, the character's structure has remained remarkably stable from its oracle bone script origins through its bronze script and seal script developments. The earliest forms clearly show a circular disc between two uprights, possibly representing it on an altar or as part of a ritual display. In the clerical script of the Han Dynasty, the character was standardized into its modern, square form, with the 玉 radical simplified and the 辟 component fixed in its current configuration. This character, along with the vast majority of the Japanese writing system, was introduced to Japan from the Korean peninsula and China between the 5th and 6th centuries CE. It was adopted as a kanji, retaining its original meaning and form. Culturally, the *bi* disc was a potent symbol of heaven and imperial authority in ancient China, often used in ceremonial rites and buried with the dead to honor them or ward off evil. This cultural significance was also imported into Japan, where such jade discs are found in *kofun* burial mounds, indicating their role in elite status and ritual. The character is central in words like 完璧 (*kanpeki*, "perfect"), which literally means "complete jade disc," a term derived from the story of the intact jade disc returned to the State of Zhao in the *Records of the Grand Historian*.