SPF = Sold Pending Funds. Meaning that an agreement has been made to sell it, but you haven't met with the buyer yet. FTF = Face To face. Meaning that you will not ship the item, the buyer will need to meet you in person.
But most on here don't care about SPF. I had many deals that I was going to buy something and the people sold it to someone else . I know now don't get your hopes up until it's in route to be in your hands.
TPM - Traded Pending Meeting SPM - Sold Pending Meeting FTF/F2F - Face To Face FS - For Sale FT - For Trade FSO - For Sale Only FTO - For Trade Only WTT - Want To Trade WTS - Want To Sell OBO - Or Best Offer OBRO - Or Best Reasonable Offer NS - Night Sights
A couple others: D/L or DL: Seller wants to see your driver's license (federal law requires you only sell guns to residents as the same state as your own, unless you get an FFL in on the transfer). GFL or GWL : Seller wants to see your gun carry permit, probably to make sure you've had the background check within the last few years.