• 天気てんき — weather
• 晴天せいてん — clear sky
• 天才てんさい — genius
• 天然てんねん — natural; spontaneous
• 天国てんごく — heaven / paradise
• 天下てんか — the world / under heaven

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The character “天” originally represented a person’s head reaching toward the sky. It symbolizes heaven, sky, and things above us — often with a spiritual or natural tone.