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The character 灰 (huī) originally depicted a hand (又) reaching into a fire (火) to take out ashes. This composition visually represents the action of retrieving what remains after combustion - ashes. Over time, the character evolved to its current form while retaining the 'fire' radical (火) at the bottom. The meaning expanded from just 'ashes' to include concepts of dust, lime, mortar, and the color gray - all relating to the powdery residue left after burning. In traditional Chinese medicine and philosophy, ashes also symbolized the end of a cycle and transformation. Arrived in Japan: The character 灰 arrived in Japan during the 5th-6th centuries CE along with the broader introduction of Chinese writing system (kanji) through Buddhist texts and cultural exchange. It was formally adopted into the Japanese writing system and appears in early Japanese texts like the Manyōshū (8th century). The Japanese reading includes 'hai' for the native reading and 'kai' for the on'yomi (Chinese-derived) reading.