Valentine's Day: How the heart shape came to symbolize love.

The origin of the heart symbol might have something to do with a North African plant.

Where did the heart symbol (♥) originate? - Quora

3,700+ Heart Shape Valentines Day Puzzle Love Stock Photos

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Symbol of Love And The Heart Shape Origins

The Symbol of Love Biology Article for Students

Happy Valentine's Day - History of the Heart Symbol – Fortunoff

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Why aren't Valentine's Day hearts shaped like the real thing?

Valentine's Day, Definition, History, & Traditions