Categories: 3-letter acronym disambiguations The original Dungeons & Dragons set Dungeons & Dragons (abbreviated as D&D or DnD or DnD) is a fantasy role-playing game (RPG) published by Gary Gygax and David Arneson in January 1974. ... The Department of National Defence, frequently referred to by its acronym DND, is the department within the government of Canada with responsibility for Canadas military, the Canadian Armed Forces. ... dnd was a computer role playing game written for the PLATO System by Gary Whisenhunt and Ray Wood at Southern Illinois University in the mid-1970s. ... In computer graphical user interfaces, drag-and-drop is the action of (or support for the action of) clicking on a virtual object and dragging it onto another virtual object. ... The TLA (three-letter acronym or three-letter abbreviation) is the most popular type of abbreviation in technical terminology, and is also very common in general language. ... The TLA (three-letter acronym or three-letter abbreviation) is the most popular type of abbreviation in technical terminology, and is also very common in general language. ...