Comparison between a current share price, portfolio of shares or a stock index and the price of the same instrument, portfolio or index at a given time in the past.

指股票的现行价格、股票组合或某种股指，与过去某一时刻相同金融工具的价格、组合或指数间的比较。

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Some stock graphics like have potential, but quantity can index is very poor, at this time you have to believe in quantity can index, don "t be deceived by the appearance of share price."

有些股票图形好像有潜力，但量能指标很差，此时你要相信量能指标，千万不要被股价的外表所欺骗。

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Despite the flooding, the 30-share benchmark index of the Bombay Stock Exchange hit a record high on Tuesday.

BBC: Mumbai residents in floods

In fact the 100 share index, the main measure of stock market value, ended the year higher than it had started.

BBC: The stock market crash of 1987: What have we learned?

The American Stock Exchange's 50-share Internet index lost more than 2.5% before recovering slightly.

BBC: News | The Economy | Bear market mood spreads