Which linguistic technique was specifically used in the creation of the language learning app name 'Duolingo', contributing to its brand memorability?

Brand names are carefully crafted linguistic artifacts that employ phonetics, semantics, and cultural associations to create specific consumer impressions. This poll explores how language science intersects with consumer product branding and how linguistic principles are leveraged in creating memorable brand identities. Test your knowledge about the strategic use of language in building billion-dollar brands!

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Portmanteau (blending 'duo' meaning 'two' with 'lingo' meaning 'language')
Onomatopoeia (the name mimics the sound of a bird call, reinforcing the owl mascot)
Reduplication (repeating syllabic elements like 'du-du' to create a rhythmic pattern)
Back-formation (creating a new word by removing parts from an existing longer word)