Common Acronyms - Getting Started. Below are some common acronyms you'll want to know before diving into the more advanced materials. I only provided a few since this list could get extremely long if we included everything. A/D: Accumulate / Distribution line (chart indicator). http://www.investopedia.com/terms/a/accumulationdistribution.asp EPS: Earnings Per Share. http://www.investopedia.com/terms/e/eps.asp FLD: Float Lock Down. http://investorshub.advfn.com/boards/read_msg.aspx?message_id=50727775 FTD: Failure To Deliver. Related to Naked Short Selling. http://www.investopedia.com/terms/f/failuretodeliver.asp MM: Market Maker. http://investorshub.advfn.com/boards/read_msg.aspx?message_id=50724699 P/E: Price per Earnings ratio. http://www.investopedia.com/terms/p/price-earningsratio.asp PPS: Price Per Share. http://www.ehow.com/how_4928002_calculate-per-share-common-stock.html NSS (or NS): Naked Short Selling. Or Naked Shorting. http://www.investopedia.com/terms/n/nakedshorting.asp If I missed any acronyms that you were looking for, please check out this enormous list on Investopedia: http://www.investopedia.com/categories/acronyms.asp?viewed=1