Closing Tick

The number of stocks which closed higher than their previous trade minus the number of stocks whose closing prices were lower than their previous trade. A positive closing tick means that there was buying at the close and indicates strength, the opposite is true for a down closing tick.

Investopedia Says:
Those closing higher are called an uptick, while those closing lower are a downtick.

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Gauge of stock market strength that nets the number of stocks whose New York Stock Exchange closing prices were higher than their previous trades, called an Uptick or plus tick, against the number that closed on a Downtick or minus tick. When the closing tick is positive, that is, when more stocks advanced than declined in the last trade, traders say the market closed on an uptick or was "buying at the close," a bullish sign. "Selling at the close," resulting in a minus closing tick or downtick, is bearish. See also Trin.