Chinese Character: 订 (Dìng - Book; Order)
Radical: 讠 (Speech radical)
Stroke Count: 4 (Number of strokes: 4)
Structure Analysis: 形声字，从言（讠，语言行为），丁声（dīng，表音）。本义指评议（如"订正"），现指预约（如"预订"）(Phonetic-semantic character: "讠" (speech) + "丁" (phonetic). Originally meant "evaluate", now means "reserve".)
Pinyin: Dìng (Fourth tone)
To be filled
I booked a hotel room for three nights. 我预订了三晚的酒店房间。
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Combine "讠" (speech) + "丁" (nail) → Verbal confirmation as firm as a nail. 组合“讠”+“丁”→ 如钉子般牢固的书面确认。