Which famous language-related company changed their logo to incorporate a linguistic concept known as 'rotational ambigram' that reads the same when turned upside down?

The intersection of linguistics and branding has created some fascinating product naming conventions and logo designs. Companies often employ linguistic principles when developing their visual and verbal identity. This poll tests your knowledge about how language principles have influenced major brand identities in ways you might not have noticed. Can you identify which linguistic innovation actually happened in the corporate world?

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Duolingo - Their owl logo was redesigned in 2019 to form an ambigram that reads identically upside down
Rosetta Stone - Their 2017 logo redesign features an ambigram where the 'R' and 'S' maintain their identity when inverted
Merriam-Webster - Their 2013 'MW' logo was carefully designed as an ambigram that reads the same upside down
Grammarly - Their 2018 rebrand introduced a 'G' that forms a perfect ambigram when rotated 180 degrees