Mount point for USB devices on Mac
OSX is much simpler than Ubuntu, the only mount that will occur to USB devices' FSs is the one with mount point located at /Volumes. Even if every file system (which of course mounts as a folder) has some little differences from an actual folder. These differences make it appear as a directory transparently to the programs, but allow apps such as Finder to differentiate folders' and volumes' icons - for example.