I've often seen the notion of the spectrum of a matrix $A \in \mathbb{F}^{n \times n}$ (Wikipedia article),
$$\sigma(A) := \{ \lambda \in \mathbb{F} \mid \lambda \text{ is an eigenvalue of $A$} \}$$
(to be interpreted as a multiset).
Is there such a name or notation for the collection of singular values of a matrix?
I've been wondering since it would compactify some of my writing as I study some linear algebra on my own (it gets tedious to keep seeing and writing "... is a singular value of" over and over again, in my opinion). Of course, since this is moreso self-study, I could just come up with my own convention, but I was wondering if there was a standard name/notation for the multiset of singular values? It certainly feels like one should exist considering their importance, but I've had no luck in finding one.