Rule 144: Restricts solicitation of buyers to complete the sell order of an insider (unless the firm is already a buyer); signified by a flashing "E" on Quotron. Revenue Tariff: A tax on imported goods levied primarily to generate revenue for the federal government. Horizon return: Total return over a given horizon. Remainder: A right of a third party to receive the use or control of property after termination of an intervening interest in that property, usually a life estate. Feedback Systems: An equation where the output becomes the input in the next iteration. This is much like a public address system where the microphone is placed next to the speakers generating feedback as the signal is looped through the PA system.