陰 (readings: いん, かげ; Japanese kanji) means “Shade / Yin / Negative / Sex Organs”. It is a Jōyō kanji taught in Japanese secondary school (junior & senior high) — the 高手 · Master tier beyond the grade 1–6 Kyōiku set, and appears in words such as 陰気 (gloomy).
What does 陰 mean?