wmueller 

D is just one data point in the Chart DOM. For some reason CQG started providing 50 levels of bid and ask data on CL so now the Chart DOM displays a lot of levels and every now and then a whopper shows up. Often it is pulled a little bit later, but sometimes it sticks and sometimes price starts heading towards it. Sometimes price even gets there. It can be a useful target.

Whats the study used to display those in orders like that?

Grantx 

Whats the study used to display those in orders like that?

It's not a study. It's the DOM Graph. Click on "Trade" then click on "Draw DOM Graph on Chart".