A set A of real numbers (blue balls), a set of upper bounds of A (red diamond and balls), and the smallest such upper bound, that is, the supremum of A (red diamond).

Supremum preserving upper probabilities
On the Supremum of a Gaussian Process
Supremum Versions of the Log-Rank and Generalized Wilcoxon Statistics
The Infimum, Supremum And Geodesic Length Of A Braid Conjugacy Class
On the Supremum of a Certain Gaussian Process
Small tails for the supremum of a Gaussian process
Supremum of block entanglement for symmetric Gaussian states
On the Supremum of Sn/nImage representation using 2D Gabor wavelets
Morphological filters--Part I: Their set-theoretic analysis and relations to linear shift-invariant filters