A brand of Palm smartphones that combined phone and PDA functionality, popular in the early 2000s.
Derived from 'trio,' referencing the device's three main functions: phone, email, and PDA capabilities. The spelling change to 'Treo' was likely for trademark purposes and brand distinctiveness.
The Treo was revolutionary for its time, essentially creating the smartphone category that the iPhone would later dominate - it had email, web browsing, and a QWERTY keyboard when most phones could barely send text messages.
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