Which famous tech company changed its logo in 2009 after discovering that users could recognize the brand with just a single letter, leading to one of the most successful logo simplifications in tech history?

Throughout history, some of the world's most recognizable logos have undergone significant transformations, often driven by technological advancements, market research discoveries, or strategic pivots. These visual identity evolutions tell fascinating stories about brand adaptation and innovation. This trivia question explores a particularly interesting logo change that resulted from a significant technological discovery.

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Facebook (changed from full name to just 'f' icon)
Google (changed from the original multi-colored logo to a simplified 'G' icon)
Apple (removed the rainbow colors from their apple logo)
Microsoft (simplified from the wavy window to four squares)