雨

yú
Rain, is the radical, the 173rd. It represents drops of water. The law of rain is to come in drops or showers not in deluges, thus this is an appropriate symbol for a fraction.
Compounds
雨伞 yǔsǎn – umbrella
雨水 yǔshuǐ – rainwater
雨林 yǔlín – rainforest
雨衣 yǔyī – raincoat
Learn more about 雨 at Wikionary
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