[Users] What does this small icon mean in engine?

Hi, Please check the attachment to see the information about my two disks. And both of disk2 and disk3 do have a small icon like a hand in the fourth column. The first column is "Alias" and the second is "ID". There is no description in the third and the fourth column. What dose the small icon mean? -- Shu Ming <shuming(a)linux.vnet.ibm.com&gt; IBM China Systems and Technology Laboratory