彩虹
cǎi hóng · HSK 7
rainbow
🌈 cǎi hóng = colorful + arc — colors arching across the sky
彩 means colorful or splendid, 虹 means arc or rainbow. Together: a colorful arc. The pronunciation 'cǎi' sounds close to 'kai' as in kaleidoscope — a burst of colors.