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The kanji "太" (futo-i, meaning 'fat' or 'thick') is a derivative and semantic extension of the character "大" (dai, ōkii, meaning 'big'). In its earliest oracle bone script forms, "大" was a pictograph of a standing human figure with arms and legs outstretched to emphasize large size. To create "太", an additional stroke or dot was added to "大", transforming it into an ideographic compound (kokuji classification). This extra mark was not merely decorative; it functioned as a semantic intensifier, signifying something that is "greatly big" or excessively large, hence conveying the meaning of plumpness, thickness, or fatness. Historically, "太" first appeared in bronze script during the Zhou Dynasty, solidifying its form. It was imported to Japan in waves, primarily from the 5th to 7th centuries AD, alongside the broader adoption of the Chinese writing system (kanji). The character was absorbed into the Japanese language, retaining its core meaning of 'fat' or 'thick' for the adjective "太い" (futoi) and also acquiring the on'yomi reading "tai". Beyond physical size, "太" carries significant cultural weight. It is a component in the word "太子" (taishi, 'crown prince'), implying greatness and importance, and is central to the philosophical concept of "太極" (taikyoku, the 'Supreme Ultimate' in Taoism), representing the primordial state from which all duality originates. This evolution from a simple pictographic modification to a character with profound literal and philosophical meanings illustrates the dynamic nature of kanji development.