Save Gender Feminine Usage Japanese Scripts 真紅, 真空, 眞紅, etc.(Japanese Kanji) Pronounced Pron. SHEEN-KOO [key] Meaning & History From 真 (shin) meaning "genuine, real, reality, truth" and 紅 (ku) meaning "crimson". Other kanji combinations can be used. As words, 真紅 (shinku) means "scarlet, crimson" and 真空 (shinku) means "space, gap, vacuum".