A measure of spread. Use quantile to get the percentile of an observation variable.
You will always need the x (the data.frame) and probs (list of percentiles you want) arguments. You will use this frequently when you want to determine an observation's position in the ordered distribution.
R Example
This example, which I found on r-tutor, extracts the 32nd, 57th, and 98th percentiles for eruption duration in the faithful dataset.
> duration = faithful$eruptions # the eruption durations > quantile(duration, c(.32, .57, .98)) 32% 57% 98% 2.3952 4.1330 4.9330
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