These indicators are numerous but only a few of them are commonly referred to. They correspond to the graphical representation of mathematical calculations. The latter represents the prices evolution, not their absolute level. They are called oscillators, as they correspond to an estimate of market tensions and behave like a derivative function.
This aspect is crucial in order to understand the representation principle of oscillators. For example, a technical indicator reversing up, getting in an up move after having been heading downward, expresses the beginning of an upward trend on the stock to which it is related. Symmetrically, this is the same on the downside. The crossing of a mid-level by indicators thus expresses a move power at its climax letting expect a lower trend pace ahead of a reversal.
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