What do the icons in Eclipse mean?

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• What do the icons in Eclipse's Package Explorer mean?
• What do the little letters on top of Eclipse icons mean?
• What's the difference between the two error icons in Eclipse (the x in the red circle and the one with the light bulb)?

I just came to SO looking for this, didn't find it, and found it on my own elsewhere. But I thought it would be good for SO to have the answer for future reference; I wondered about them all the time when I was new to Eclipse (this was before I discovered SO).

This is a fairly comprehensive list from the Eclipse documentation. If anyone knows of another list — maybe with more details, or just the most common icons — feel free to add it.

Latest: JDT Icons

2019-06: JDT Icons

2019-03: JDT Icons

2018-12: JDT Icons

2018-09: JDT Icons

Photon: JDT Icons

Oxygen: JDT Icons

Neon: JDT Icons

Mars: JDT Icons

Luna: JDT Icons

Kepler: JDT Icons

Juno: JDT Icons

Indigo: JDT Icons

Helios: JDT Icons

There are also some CDT icons at the bottom of this help page.

If you're a Subversion user, the icons you're looking for may actually belong to Subclipse; see this excellent answer for more on those.

I can't find a way to create a table with icons in SO, so I am uploading 2 images.

In eclipse help documentation, we can all icons information as follows. Common path for all eclipse versions except eclipse version:

https://help.eclipse.org/2019-09/index.jsp?nav=%2F1