Up tick – A term used to designate a transaction made at a price higher than the preceding transaction. Also called a "plus" tick. A "zero-plus" tick is a term used for a transaction at the same price as the preceding trade but higher than the preceding different price. Conversely, a down tick, or "minus" tick, is a term used to designate a transaction made at a price lower than the preceding trade. A plus sign, or a minus sign, is displayed throughout the day next to the last price of each stock at the trading post on the floor of the New York Stock Exchange.