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Investopedia explains 'Zero Plus Tick'
For example, if a succession of trades occurs at $10, $10.25 and $10.25 again, the latter trade would be considered a zero plus tick, or "zero uptick", trade.
It was thought that short selling on downticks may have led to the stock market crash of 1929, but the uptick rule was lifted in 2007 after the SEC concluded that markets were advanced and orderly enough to not need the restriction. It is also believed that the advent of decimalization on the major stock exchanges helped to make the rule unnecessary.
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