square-dot from coolicons in Line with regular corners. checkbox, selected, point, center, bullet, box, record. Other styles and corners: @coolicons/<style>/<radius>/square-dot with line, duocolor, duotone, fill or bulk and sharp or round. Leave out regular, like @coolicons/fill/square-dot, and use @coolicons/square-dot for line with regular corners.
pnpm dlx shadcn@latest add "https://coolicons.cool/r/square-dot.json"