Welcome to the community @supershinysea!
The square icons represent
div elements—with “Section” and “Container” representing the class name. These
div elements are the building blocks of all of the structure you see on the web.
While the class name is the same, it’s important not to confuse these with the Webflow-specific elements like
container—these are just
div elements with special pre-applied styles to make them behave in certain ways out of the box. To prevent any confusion with class names, each element type has its own icon. In your screenshot, the fourth section icon represents the Webflow
If you come from a web development background, it’s worth noting that the
section element (strangely) does not relate at all to the Semantic Element type with the same name—all Semantic Tags can be set, on any element, within the Element Settings panel:
Hopefully that helps clarify things, but don’t hesitate to reach out if you have any other questions