# THT: What is a squared annular “ring”? [duplicate]

At least in KiCad, the footprints of through-hole pin headers have one squared annular “ring”, the other ones are round:

What does the square indicate?

(Also I’m wondering if there is perhaps a convention of connecting GND to it.)

## marked as duplicate by Marcus Müller, pipe, Finbarr, Bimpelrekkie, RoyCMar 25 at 17:29

• have you also noticed that the square usually has a 1 label? – jsotola Mar 24 at 16:47