• 七色なないろ — seven colors / rainbow
• 第七だいなな — the seventh
• 七回ななかい — seven times
• 七夕たなばた — Tanabata
• 七福神しちふくじん — Seven Lucky Gods

七 is one of the basic number kanji. It is often read as しち, but なな is commonly used in daily speech to avoid confusion with いち (one).