CAD Overlay CAD Overlay CAD Overlay is a commercial software application for raster-to-vector translation in 2D computer-aided design (CAD) and drafting — available between 1988 and 1996 as a third-party application for AutoCAD and other CAD systems. Developed and marketed by Image Systems Technology, CAD Overlay was first released in January 1988 running on AutoCAD Version 2.6. CAD Overlay replaced the previous generation of automatic raster-to-vector translation systems by embedding scanned documents and images directly in the CAD system. CAD Overlay was derived from a custom AutoCAD application developed using the Nth Engine graphics board in 1987 by David Chassin for Image
Acronym was formed from the Greek words , ', "topmost, extreme" and , ', "name.") For example, the army offense of being "absent without official leave" was abbreviated to "A.W.O.L." in reports, but when pronounced as a word ("awol"), it became an acronym. While initial letters are commonly used to form an acronym, the original definition was "a word made from the initial letters or syllables of other words", for example UNIVAC from UNIVersal Automatic Computer. In English, acronyms "pronounced as words" may be a 20th-century phenomenon. Linguist David Wilton in "Word Myths: Debunking Linguistic Urban Legends" claims that "forming words