[WilliamSt]

I really wish people could make it a habit to define acronyms.

[curiousgal]

I really wish people could make it a habit to read articles.

The article defines the acronym and even mentions where it comes from.

[sxg]

True, but the definition is in the very last line of the whole page. For people unfamiliar with an ROC curve, which seems to be the target audience, it should be defined the first time it's used.

Edit: on navigating the site a little more, the previous section does define the acronym on its first use.

[pps43]

In this case knowing that ROC stands for Receiver Operating Characteristic wouldn't help much.

[thomasahle]

It would let me know that we are not talking about finance, say return on capital or rate of change.

This in turn would help me decide whether I might want to read the article, given that the title is the only resume given on the front page.

Thank you for putting it in the comments though :-)

[pps43]

Actually ROC curves are commonly used in finance, e.g., to quantify separating power of various credit risk models.