saleor-dashboard/src/icons/Checkbox.tsx

import { createSvgIcon } from "@material-ui/core/utils";
import React from "react";

const Checkbox = createSvgIcon(
  <>
    <rect
      x="5"
      y="5"
      width="14"
      height="14"
      stroke="currentColor"
      fill="none"
    />
  </>,
  "Checkbox",
);

export default Checkbox;