In the context of finance, the term beta refers to

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Beta (β) is a measure of the volatility—or systematic risk—of a security or portfolio compared to the market as a whole. Equities having a beta value larger than one, or high beta stocks, are often known as volatile stocks. The slightest adjustments in stock market indicators have a big influence on them. A security that is comparatively more stable is a low beta stock i.e. has a beta rating below 1.