The most common theory suggests that the 52 cards in a standard deck represent the 52 weeks in a year.
Here's a breakdown of the symbolism:
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The Four Suits: These are often associated with the four seasons – Spring, Summer, Autumn, and Winter.
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Thirteen Cards per Suit: The 13 cards within each suit (Ace through King) are thought to represent the thirteen weeks in each season.
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Total Count: Multiplying the four suits by the 13 cards in each suit results in 52 (4 x 13 = 52).
While this explanation is popular and widely cited, it's important to note that the exact origins and symbolism are debated and may have evolved over time. The standardization of the 52-card deck occurred gradually.