The kanji 硫 primarily represents "sulfur" or "brimstone," a chemical element known for its yellow color and pungent odor. It's used in various contexts related to the element itself and substances containing it.

・On-yomi (音読み): リュウ (ryuu) ・Kun-yomi (訓読み): None, as the meaning is primarily represented by its on-yomi.

⚫︎ 硫黄 (いおう / iou) Translation: Sulfur ⚫︎ 亜硫酸 (ありゅうさん / aryuusan) Translation: Sulfurous acid ⚫︎ 硫化水素 (りゅうかすいそ / ryuukasuiso) Translation: Hydrogen sulfide

The kanji 硫 is a phono-semantic compound (形声文字 / keisei moji). The left side is the radical 石 (いし / ishi), meaning "stone" or "rock," and the right side is the phonetic component 㐬 (ryuu), which contributes to the pronunciation リュウ (ryuu). The combination suggests a stone-like substance, referencing sulfur, which is often found in mineral form.