Is $VOLD the same as Delta?

I have been trying to learn a little bit more about market internals, specifically because I want to try to translate it to the DAX. I have tried to find out about whether anyone has found a translation already, but I couldn't find it.

One of the market internals is $VOLD or Volume Difference. But when I googled it, I thought that the description sounded very much like Delta.

Am I right to think that?

Is $VOLD the same as Delta?