pin number = personal identification number
pdf format = portable document format format
"RAS syndrome (short for "redundant acronym syndrome syndrome") is the redundant use of one or more of the words that make up an acronym or initialism with the abbreviation itself, thus in effect repeating one or more words. " (wikipedia)
HIV virus = Human Immunodeficiency Virus virus
LAN network = Local Area Network network
LCD display = Liquid Crystal Display display
KFC chicken = Kentucky Fried Chicken chicken
SAT test = Scholastic Aptitude Test test
(http://www.nanday.com/rap/)
