Which famous logo was specifically redesigned in 2009 to incorporate the 'smile theory' from linguistics, where the upward curve mimics the phonetic shape the mouth makes when pronouncing the brand name?

In the intersection of linguistics and retail branding, many famous logos incorporate subtle language elements that enhance brand recognition and memorability. Linguistic principles like phonetics, semantics, and orthography often inform logo design decisions. This trivia explores how language science influences one of the world's most recognized logos, and how linguistic theory plays a crucial role in visual brand identity.

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Amazon (with its arrow forming a smile from A to Z)
Coca-Cola (with its flowing script representing liquid phonetics)
Google (with its alternating vowel colors representing speech patterns)
Twitter (with its bird shape symbolizing the phonetic 'tweet' sound)