Envelope

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Envelope

In technical analysis, two moving averages of a security's price indicating its upper and lower limits. That is, a price tends not to move above the higher moving average or below the lower moving average. Analysts use envelopes to help them determine buy and sell signals. When a price reaches the higher moving average, analysts may declare a sell signal, while they may declare a buy signal when a price reaches the lower moving average.
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The Proofpoint Anti-Spam Laboratory has already pushed the envelope in building our MLX technology for spam detection," stated Eric Hahn, founder and chairman of Proofpoint.
While Cornerstone has consistently produced some of the industry's finest monitor technology, Matrox has always pushed the envelope on developing graphics chips that deliver the highest image quality and refresh rates in the most demanding resolutions," said Mitch Furman, senior product manager, Display Technology, Matrox Graphics.