Indeed, it's freestanding, the repo name doesn't have the correct term, but the source file does near the end: https://github.com/lopespm/zig-minimal-kernel-x86/blob/main/...

Also baremetal where the metal is virtual. LLVM uses this term for when an OS isn't available https://github.com/llvm/llvm-project/tree/main/libc/src/stdl...