Which famous dictionary brand's logo contains a linguistic easter egg that represents its core mission?

Brand logos often contain fascinating linguistic elements that connect to their identity or history. Some incorporate ancient scripts, others play with typography to create subliminal meanings, and many use linguistic principles in their design. Test your knowledge of how language and linguistics intersect with some of the world's most recognized brand identities!

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Merriam-Webster, with a small infinity symbol hidden in the hyphen that represents the endless evolution of language
Oxford Dictionary, whose 'O' is designed as an IPA (International Phonetic Alphabet) symbol for the open back rounded vowel
Collins Dictionary, whose logo includes a stylized pen nib that forms the International Phonetic Alphabet symbol for knowledge (/n/)
Longman Dictionary, whose logo incorporates the ancient Sumerian cuneiform symbol for 'word' as a nod to the earliest written language