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When i hold down the super (windows) key, numbers and in some cases letters appear over open apps and other unity things (workspace switcher, trash).

The first 10 Open or pinned apps are numbered 1, 2, 3.. ..8, 9, 0. Subsequent apps are not numbered.

What are the numbers/letters for?

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See the first answer in this previous question… – Mark Rooney Oct 22 '11 at 9:57
up vote 3 down vote accepted

If you press super+the number/letter it will focus/open that program the same way your mouse would.

All the key board shortcuts available for unity are listed here.

Here is a quick list:

enter image description here

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while holding the SUPER key, you can press the numbers/letters that appeared and the get the same effect as a mouse click on that symbol would have.

To learn more about the keyboard shortcuts of unity look here.

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