Which linguistic innovation did Apple employ when naming its 'iPhone' that has since become a common product naming convention across the tech industry?

In the world of product design, language plays a crucial role in shaping consumer perceptions and behaviors. Linguistic choices in product naming, packaging, and marketing can significantly impact market success. This trivia question explores how a specific linguistic technique revolutionized a product category through innovative naming conventions.

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The lowercase 'i' prefix denoting 'internet-connected' that created a brand language system (iMac, iPad, iTunes)
Using a compound word combining the product function (phone) with the company name (Apple)
Applying the phonological rule of vowel fronting to create a more modern-sounding product name
Implementing a syllabic stress pattern that emphasizes the second syllable for greater recall