In the Nichijou short 8, Yuuko Aioi goes fishing.
After fishing up a boot and kettle, she leaves and this upside down heart shape on a leave floats by.
Supposedly this is a symbolism of sorts, hence what is this symbolizing?
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It's a peach. As Aki Tanaka commented, this is a reference to the story of Momotaro, in which an old woman finds a peach floating down a river. When she and her husband attempt to eat it, they find a boy inside.