label in the SciPy documentation (source code)

= label in the SciPy documentation
{c}

https://docs.scipy.org/doc/scipy/reference/generated/scipy.ndimage.label.html

Official scipy.ndimage.label documentation: zero background, nonzero features, centrosymmetric neighborhood structure and default cross-shaped two-dimensional connectivity. The two-by-two diagonal example in the article is synthetic.