The kanji 硫 represents sulfur, a chemical element. It's the core meaning of this character, referring to the yellow, nonmetallic element.

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

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

The kanji 硫 is a phono-semantic compound. It is composed of the radical 石 (ishi), meaning "stone" or "mineral", on the left side, and the phonetic component 㐬 (ryuu) on the right side. The radical 石 provides the semantic element, indicating that sulfur is a mineral or a substance found in the earth. The component 㐬 provides the sound. This formation indicates that the character was created to represent a substance related to minerals that has a specific sound.