What does this track indicator mean ?

Hi,
 
I'm using an old version of Sonar (v5) so not sure if this attribute carried in later versions, but hopefully somebody can answer:
 
At the end of an audio track within the track view I am for the fist time seeing a gray vertical line with a triangle at the bottom.  What does that indicate?  Does it have a name or reference so I can search to find more within the help file?
 
Thanks,
 
      Sonic

I figured it out....   
 
If you go into an audio clip's properties and set the offset field to something other than zero it creates the situation described above (where at the end of the clip appears a grey vertical line with triangle at bottom).

Still not sure what this is supposed to mean other than a visual indicator that the offset for that clip is not 0....
Also, not sure if this behavior exists in later versions of Sonar or the latest CW, but just thought I'd follow up with the answer.
 
Sonic