I'd call them "non-icons": they don't communicate in any way, they don't add significance or separate one application from the other at first glance, they don't really mean anything without the file name, they are really not much better than default icons. And this is probably what they are: default icons for a group of applications with a bit of variation sprinkled on top.
At this point, does it need that residual variation or is this just adding noise? Also, a shape inside a shape inside a shape inside a shape isn't anything anyone is likely to parse – how many bits of information is this? So maybe just go with a simple default wrench icon for all of them?