acronym

Today,we studied the word "acronym".there are many words of acronym, for example,NAFTA =North American Free Trade Agreement, NASA=National Aeronautics And Space Administration, NATO=North Atlantic Treaty Organization, CUPE=Canadian Union of Public Employ,CSIS=Center For Strategic And International Studies, ROTFL=Rolling On The Floor Laughing, LOL=Lough Out Loud, WYSIWYG=What You See Is What You Get, CAD=COMPUTER-AIDED DESIGN, CAM=COMPUTER-AIDED MANUFACTURING, NORAD=NORTH AMERICA AIR DEFENSE COMMAND.Haha,some words of acronym in internet are so interesting.