What is this icon?
Some codes are "hidden" because of this icon, when I click it, the IDE pops up the code snippet that's supposed to be there before, since codes disappeared, I can't reference it from other files either.
A symbol is a semantic element in some model, e.g., language or framework model. The IntelliJ Platform uses Symbol to represent symbols, and Symbol serves as a link between Platform APIs, such as navigation, finding usages, or renaming.
Gutter Icons They invoke some basic actions and other framework- and technology-specific features. Use the Gutter Icons page in Settings/Preferences to hide or show icons in the gutter. Note that technology-related icons are displayed only if the corresponding plugin is installed and enabled.
If you are using a version control system (such as Git) in the project you are working on with the IDE, you will see these marks on the files (See sample images below).
These are seen when the changes are not yet committed. Once all the changes are committed the marks are gone.
If you click on those marks you will see the content that was there before the change took place.
The same principle is applied for files (see below images)
While working you see the files like this (deleted ones are omitted):
And, by the time you're committing changes you will see them like this (you see all files changed):
See official doc for more info.
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