A scale ranging from 1 to 10+, the Oh-Holy-Shit scale began as a tongue-in-cheek scale for ranking Core Corp military ships in the early days of interplanetary travel. It was used mostly in marketing material, but through the several government restructures that have happened since then, it’s been adopted by the regulatory committee responsible for assigning classifications to spacefaring vessels, the GCSC. (source: GCSC About Us hawkingnet site)