Spike

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Dictionary Says

Definition of 'Spike'

1) The comparatively large upward or downward movement of a price or value level in a short period.

2) The trade order execution confirmation slip which shows all the pertinent data, such as the stock symbol, price, type and trading account information.
Investopedia Says

Investopedia explains 'Spike'

1) A good example of a negative spike in the financial markets is the infamous stock market crash of Oct 19, 1987, when the DJIA plunged 22% in a single day. There are plenty of more common, less drastic examples which are periodically seen in individual stocks when unexpected news or events, such as better-than-expected earnings results, reaches investors.

2) This usage originates from the antiquated practice of placing paper trade order slips on a metal spike upon completion.

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