What does IMF mean in Mathematics?

Intrinsic Mode Function

An IMF is defined as a function that satisfies the following requirements: (1) In the whole data set, the number of extrema and the number of zero-crossings must either be equal or differ at most by one. At any point, the mean value of the envelope defined by the local maxima and the envelope defined by the local minima is zero. (2) It represents a generally simple oscillatory mode as a counterpart to the simple harmonic function. By definition, an IMF is any function with the same number of extrema and zero crossings, whose envelopes are symmetric with respect to zero. (- Wikipedia)

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