I believe the number 4 corresponds to the number of individual PCBs and the number 1 is for one panel.
- Is this the way panelized PCBs are commonly referenced? With an asterisk mark?
- What does the "-up" mean in Panel-up?
- Is there a more common way when to refer to quantities and descriptions of panelized PCBs?
Here is a link to where I saw the term used.