fivenum

A measure of spread and shape. Returns Tukey's five number summary for a dataset:

minimum	smallest value
lower hinge	~ 25% value
median	middle value
upper hinge	~75% value
maximum	greatest value

These are depicted pretty well with box plots. I'll link to that when I write it.

R Example

> fivenum(faithful$waiting)

[1] 43 58 76 82 96