What does this button do in the iTunes device sync status bar?

Question

When an iPhone is plugged in and syncing, the status bar shows a message like:

Syncing "Phone" (Step 2 of 6)

On the left side of the bar there is this icon:

It darkens when clicked, which implies that it's a button. If I had to guess from the icon alone, I would say "rotate clockwise", but that doesn't make sense in this context.

Hovering does not display a tooltip. Clicking it does not have any visible effect.

What is this button?

Answer 1

It is the skip button for skipping the current process. The button usually only shows on skippable actions and is most commonly shown for an iOS device iTunes backup.