Technology and office jargon. "jargon" refers to terminology used by people within a specific activity or profession. If you use jargon well, it shows if you are proficient in the subject or not than is to say if you are an insider or an outsider. Many fields have influenced office jargon, but now information technology and the internet have given rise to a new office jargon that is used not only in e-mail and other written forms but also at meetings and in everyday language. New words phrases and acronyms are introduced, continually. So when you hear about something being 404 instead of being list or not found, it's one of those new jargon words referring to the common internet page error. New words or acronyms are also common such as e-tailing for electronic retailing or PRN (No response Necessary). Some people seem to enjoy this form of communication others feel obliged to use it only to keep up with their colleagues. Regardless, sooner or later you are bound to come across these and thousands of other such office expressions.