It is an icon that indicates that the left scroll wheel is used for menu navigation, same as the cruise control icon on the right side indicates that the right scroll wheel is used for cruise control operations.
I wonder why every media call them buttons and think that they are deactivated when nothing happens when they try to press on them instead of using the scroll wheels...
I wonder why every media call them buttons and think that they are deactivated when nothing happens when they try to press on them instead of using the scroll wheels...