PDA (n.) pee•dee•ay: acronym for personal data (or digital) assistant. Portable computers designed to act as organizers, communication devices, and note takers. They are small and often possess the latest in compact user interfaces.
What do you mean, you don't have one?
Alliance LLC, Menomonee Falls, Wis., surveyed 100 meeting professionals and asked them what items were among their “must-have” resources. A PDA was near the top.