Pressing the Option key when the Launchpad is active will cause all the Icons to wiggle..
Some Icons will display a small circle with an x inside at the left upper corner.
What is the significance of this circle?
The wiggling action is supposed to indicate that the icons can be moved and re-arranged. But this seems to be not necessary, because the icons can be moved by mouse click alone, without pressing the Option key. Is there another hidden meaning to this?