弦 (readings: げん, つる; Japanese kanji) means “Bowstring / Chord / Hypotenuse”. 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 弦楽器 (string instrument).
What does 弦 mean?