Treo

Treo refers primarily to a line of smartphones produced by Palm, Inc. Introduced in the early 2000s, Treo devices combined telephone capability with a personal digital assistant (PDA), integrating calendar, contacts, email, and a mobile Web browser into a single device. Early Treos ran the Palm OS, while later models used Windows Mobile.

Key models include the Treo 600 (released in 2003), followed by the 650, and the 700 series (including 700w and 700p). Subsequent versions included the Treo 750 and 755p, and the Treo Pro. These devices typically featured a portrait-oriented touchscreen, a hardware keyboard, and expandable memory, with carrier-specific editions common and mobile email a central focus for many users.

With the rise of touch-centric smartphones, particularly the iPhone and Android devices, the Treo line faced declining sales. Palm shifted its strategy to the webOS platform, initiating the Palm Pre family in 2009. After Palm was acquired by Hewlett-Packard in 2010, the Treo brand gradually faded from the market. The Treo line is remembered as one of the early attempts to fuse phone and PDA functionality into a single, pocketable device and for helping popularize mobile productivity.

Other uses of the term Treo are limited, and the name is primarily associated with the Palm Treo smartphones. There are no widely recognized distinct meanings beyond this primary use.