Chapter 9. Symbolic Input
We turn our attention in this chapter to the task of symbolic input, a 3D interaction task that has been studied relatively little compared to travel, wayfinding, selection, manipulation, and system control. Symbolic input is the task in which users communicate symbolic information (text, numbers, and other symbols or marks) to the system. Everyone who uses computers performs symbolic input tasks constantly—writing email messages, entering numbers into a spreadsheet, composing documents, and so on. The importance of symbolic input in 2D interfaces is clear, but why is symbolic input an important task in 3D UIs?
Symbolic communication—the use of abstract symbols to represent objects, ideas, concepts, ...