What is HVL?

I received a tweet from @BolaBabatunde asking:
What does HVL stand for?
in reference to this post:

HVL stands for High Volume Level. You'll notice that it's used interchangeably with POC (Point of Control).

The POC and the HVL measure the price at which most of the action took place in the market. The POC measures it using time. The HVL measures it using volume. Let me know if you have any other questions and I'll expand.
Sounds similar to HVN = High Volume Node.