<p>Following @gung's comment above, I pinged @Kjetil and asked to provide a wiki excerpt. He kindly agreed, and so here is the new excerpt:</p>
<blockquote>
<p>A kind of moments based on linear functions of order statistics. Their interpretation is similar to usual moments, but they can often be more stably estimated.</p>
</blockquote>
<p>and wiki:</p>
<blockquote>
<p>L-moments are a kind of moments based on linear functions of order statistics. Their interpretation is similar to usual moments, but they can often be more stably estimated.</p>
<p>Their use was pioneered in hydrology, as a help in studying the form of probability distributions. See <a href="https://en.wikipedia.org/wiki/L-moment" rel="nofollow noreferrer">https://en.wikipedia.org/wiki/L-moment</a>.</p>
</blockquote>
