• 点てん — point / score
• 満点まんてん — perfect score
• 点数てんすう — number of points
• 点火てんか — ignition
• 重点じゅうてん — emphasis / key point
• 欠点けってん — weak point / demerit
• 点検てんけん — inspection / check

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点 originally suggests a small mark or spark. From that idea, it expanded to mean points in tests, scores in games, key points in discussions, and even the act of igniting fire.