uptick

1. An increase, especially a small or incremental one: last week's uptick in interest rates.
2. A transaction in a stock market security above the price of the previous transaction.

[From the indication of a rise in price of a stock by a plus sign on boards above stock market stations.]

A transaction occurring at a price above the previous transaction. In order for an uptick to occur, a transaction price must be followed by an increased transaction price. This term is commonly used in reference to stocks, but it can also be extended to commodities and other securities.

Investopedia Says:
For example, suppose stock ABC previously traded at $10. If its next trade occurred at a price above $10, ABC would be on an uptick.

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Transaction executed at a price higher than the preceding transaction in that security; also called Plus Tick. A plus sign is displayed throughout the day next to the last price of each stock that showed a higher price than the preceding transaction in that stock at the Trading Post of the Specialist on the floor of the New York Stock Exchange. See also Short-Sale Rule.

The noun has one meaning:

Meaning #1: a transaction in the stock market at a price above the price of the preceding transaction
  Antonym: downtick (meaning #1)