Tracker Ball : (ICT) A point and click device similar to a mouse. A palm-sized ball is nested in a cradle and as you roll it around, the mouse pointer moves around on the screen. Popular with CAD applications
Teach-ICT.com (Information and Communications Technology), Browse by alphabet, USA 2015. http://www.teach-ict.com/glossary/E/ergonomics.htm , (Info and Commun Tech - Amer) {736}