checkbox-indeterminate-20-filled

pnpm dlx shadcn@latest add https://opensourceicon.com/r/fluent/checkbox-indeterminate-20-filled.json

<svg xmlns="http://www.w3.org/2000/svg" width="96" height="96" viewBox="0 0 20 20"><path fill="currentColor" d="M6 3a3 3 0 0 0-3 3v8a3 3 0 0 0 3 3h8a3 3 0 0 0 3-3V6a3 3 0 0 0-3-3zM4.5 6A1.5 1.5 0 0 1 6 4.5h8A1.5 1.5 0 0 1 15.5 6v8a1.5 1.5 0 0 1-1.5 1.5H6A1.5 1.5 0 0 1 4.5 14zM7 6a1 1 0 0 0-1 1v6a1 1 0 0 0 1 1h6a1 1 0 0 0 1-1V7a1 1 0 0 0-1-1z"/></svg>