Questions about the schematics

[matmosphere]

I was thinking about breadboarding the 424 (and maybe a few others) but I do not understand what the pin connections are on the schematic. There are three, one by the input, one by the output and one by the 9v in. I've only breadboarded a few very simple circuits so far, but I haven't run into that one something I want to try out.

[m-Kresol]

The little 'flag' symbols are markings of the nets in Eagle. Brian also uses them to properly label the in/out/9v/gnd. The small circle symbols are the actual pins for the pcb layout, so you have a solder lug on the pcb to hook up to.
hope that makes sense

[matmosphere]

Thanks man, I had figured it had something to do with the production process but I wasn't positive so I thought I'd ask.