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Apparently so, although it seems to have a separate history and meaning from other historical uses. From Wikipedia:
Since ancient times in Japan, the heart symbol has been called Inome (猪目), meaning the eye of a wild boar, and it has the meaning of warding off evil spirits. The decorations are used to decorate Shinto shrines, Buddhist temples, castles, and weapons.
Apparently so, although it seems to have a separate history and meaning from other historical uses. From Wikipedia:
https://en.wikipedia.org/wiki/Heart_symbol