Which product holds the Guinness World Record for 'Most Units Sold of a Single Product Design' with over 375 billion units sold since its 1949 creation?

The Guinness World Records has certified countless retail and product achievements over the years. From the largest product recalls to the most sustainable retail initiatives, brands are constantly competing to break records and make history. This trivia question focuses on a famous product design record that revolutionized retail marketing and continues to influence customer feedback today. Can you identify the correct record-breaking achievement?

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LEGO Minifigure
Bic Cristal Ballpoint Pen
Post-it Note
Sony PlayStation Controller