The '+' in this case is a common process node trope where improvements to a node over time that involve rules changes become Node+, Node++, Node+++, etc. So th

The '+' in this case is a common process node trope where improvements to a node over time that involve rules changes become Node+, Node++, Node+++, etc. So this is a node that started as Samsung 10nm, but they made enough changes to it that they started marketing it as 8nm. When they started talking about it, it wasn't clear if it was a more manufacturable 7nm or instead a 10nm with lots of improvements, so I drop the 10nm++++ to help give some context.