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Unrealized Gain/Loss - The theoretical gain or loss on Open Positions valued at current market rates, as determined by the broker in its sole discretion. Unrealized Gains' Losses become Profits/Losses when position is closed.
Uptick - a new price quote at a price higher than the preceding quote.
Uptick Rule - In the U.S., a regulation whereby a security may not be sold short unless the last trade prior to the short sale was at a price lower than the price at which the short sale is executed.
US Prime Rate - The interest rate at which US banks will lend to their prime corporate customers.