Trimean
The trimean is defined to be
where
are the Hinges and 
is the Median. Press et al. (1992)call this Tukey's Trimean. It is an L-Estimate.See also Hinge, L-Estimate, Mean, Median (Statistics)
References
Press, W. H.; Flannery, B. P.; Teukolsky, S. A.; and Vetterling, W. T. Numerical Recipes in FORTRAN: The Art of Scientific Computing, 2nd ed. Cambridge, England: Cambridge University Press, p. 694, 1992. Tukey, J. W. Explanatory Data Analysis. Reading, MA: Addison-Wesley, pp. 46-47, 1977.
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