The term 'TOSS' is an acronym for 'Transfer of Ownership and Sale of Securities'. It is a process used in the financial industry to transfer ownership of securities from one party to another. The process involves the buyer and seller agreeing on the terms of the sale, the buyer paying the seller, and the seller transferring the securities to the buyer. The process is regulated by the Securities and Exchange Commission (SEC) and must be completed in accordance with SEC regulations.