Chou Collection, Upper Volume Radical: Mouth (kǒu) Character: di Kangxi strokes: 17 Page 211, Entry 24 Collected Rhymes (Jiyun): Pronounced di. It means sound. Cheng Gong Sui, Rhapsody on Whistling (Xiaofu): The sound is delicate and flowing, clear, sharp, and vibrant. Annotation: Vibrant refers to a rapid sound.