Yeah, go big or go home with this kind of stuff. Give me some Linux kernel source code, maybe even some well-known RFC!

So much "nerd" paraphernalia is BS... This one is ridiculous (one doesn't get to "be a programmer" by sorting and collecting 10 personality traits as if they're goals or achievements) but at least it shows varied syntax in the C language: the number of unique keywords is very high.

To show you're a nerd, don't go with obvious "look, this is what I am" but use dogwhistles (Conway's Game of Life or fractals can look like knitting patterns) or to be obvious, some things you personally like or made. Badge with your distro's logo or mascot, code you actually wrote or its output, wearable blinkenlights project... Just be more focused on your interests than yourself.