IxD
n.— «Interaction design is a sub-discipline of design which examines the role of embedded behaviors and intelligence in physical and virtual spaces as well as the convergence of physical and digital products. Sometimes referred to by the acronyms “IxD” or “iD,” interaction design has recently developed as a field of study in a growing number of universities throughout the world.» —“Activate the park!” Canadian Architect (Toronto, Canada) Mar. 28, 2006. (source: Double-Tongued Dictionary)