• 何なに — what
• 何人なんにん — how many people
• 何時なんじ — what time
• 何時いつ — when
• 何日なんにち — what day
• 何事なにごと — what happened / what matter
• 何回なんかい — how many times

One of the most frequently used kanji in everyday Japanese questions. Originally derived from 荷 (to carry), the meaning evolved to express uncertainty and inquiry.

何なんですか？
What is it?

何なにを食たべますか？
What will you eat?

何時なんじに会あいましょうか？
What time shall we meet?