... what?
I need a context. I'm automatically thinking footnotes and the like, so I'm not sure what you're talking about, specifically.
Chapter 1
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*
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Chapter 2
repeat.
Scene breaks are usually denoted with #. (At least that's what I was taught.)
I've never seen just one. Usually it's 3. Like *** or ###.
Scene Breaks (same as line breaks, but sometimes named differently)
Definition: When moving forward in time, to a different location, or to a different person’s perspective in fiction WITHOUT ending the chapter, an scene break is called for.
Use in industry: One of the most confusing issues in writing, a "scene break" is also considered a line break or POV switch. An author should either use an extra double space (the ONLY time when this is acceptable) or a single or double hash mark ("#", found above the number 3 on the keyboard), against the left margin to indicate a line break.

OK, how about using scene breaks in a chapter-less piece? A short, for instance, with no chapters. Can scene breaks work to clearly show scenes when a piece is too short for chapters.
I used *** for mine and neither my agent nor my editor commented or rejected me for itAs long as it's clear that you're jumping ahead to a new scene within a chapter, or a new scene if you have no chapters, you're fine.