Decals, decals, decals! Military, product, logo, qr code, barcode, lettering, letters, dots, triangles, greek symbols, prop markings, binary, etc.
Gumroad - https://gumroad.com/products/CIUFZ
I've made all of them for props I was doing on my channel. Feel free to grab it and use on your project. It includes original psd to edit font and text if you need.
If you credit me it's good if not it's okay too :) Just don't sell it or redistribute.
I used a couple of them in this texturing video - https://www.youtube.com/watch?v=tMx8UnniomQ