[sdiy] square pads

[David G. Dixon]

Hey Team,

Here's a dumb question:  What does a square pad on a PCB mean?  Here's what
I think it means:

- the positive rail on a power connector
- the jack tip on a jack connector
- the #1 terminal on a pot connector (the one on the right looking at the
back of the pot)
- the #1 terminal on a switch connector (the one on the bottom of SPDT, or
on the bottom right of DPDT, looking at the back of the switch)
- the #1 pin on an IC

If there are more common uses for a square pad, or if any of these are
wrong, could someone please let me know?  I'd like to make my handmade
boards a bit easier to use for kit builders.  Thanks in advance!