I'msorry,butyourrequestisn'tclear.CouldyouprovidemorecontextordetailssoIcanassistyoubetter?Ifyou'rereferringto"SF999",it'samodelofship,perhapsaferry,butwithoutmoreinformationit'shardformetoprovidespecifichelp.If"ws"referstoatermorabbreviation,pleaseprovidethefullcontextsoIcangiveyouapreciseanswer.