Chinese Character: 笛 (Dí - Flute; Whistle)
Radical: 竹 (Bamboo radical)
Stroke Count: 11 (Number of strokes: 11)
Structure Analysis: 形声字，从竹（材料），由声（yóu，表音）。本义指竹制管乐器（如“竹笛”），现也指汽笛（如“警笛”）。(Phonetic-semantic character: "竹" (bamboo) + "由" (phonetic). Originally meant "bamboo flute", now also refers to whistles.)
Pinyin: Dí (Second tone)
To be filled
He is playing the bamboo flute. 他正在吹奏竹笛。
The ship's whistle sounds at noon. 轮船的汽笛在正午鸣响。
Combine "竹" (bamboo) + "由" (reason) → Bamboo with holes makes sound. 组合“竹”+“由”→ 有孔的竹子发声原理。