diamond-plus from coolicons in Line with regular corners. add, new, create, insert, expand, increase, rhombus, lozenge. Other styles and corners: @coolicons/<style>/<radius>/diamond-plus with line, duocolor, duotone, fill or bulk and sharp or round. Leave out regular, like @coolicons/fill/diamond-plus, and use @coolicons/diamond-plus for line with regular corners.
pnpm dlx shadcn@latest add "https://coolicons.cool/r/diamond-plus.json"