Please define the statistical concept of Quartile deviation.

I was wondering some one on this forum knows about the Quartile deviation as a Statistical Method.
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"QUARTILE DEVIATION The quartile deviation is defined as half of the difference between the third and first quartiles. Source:"
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One-50 % of the visible difference between the upper and lower, that is certainly, the third and very first, quartiles. Also known as trailer truck-interquartile variety.
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