The variation of a function which exhibits slope changes, also called the saltus of a function. A series may also oscillate, causing it not to converge.

Jeffreys, H. and Jeffreys, B. S. "Bounded, Unbounded, Convergent, Oscillatory." §1.041 in Methods of Mathematical Physics, 3rd ed. Cambridge, England: Cambridge University Press, pp. 11-12 and 22, 1988.

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Weisstein, Eric W. "Oscillation." From MathWorld--A Wolfram Web Resource. http://mathworld.wolfram.com/Oscillation.html