Ruler

<svg
    xmlns="http://www.w3.org/2000/svg"
    width="512pt"
    height="512pt"
    viewBox="0 0 512 512"
>
    <linearGradient
        id="a"
        x1="0"
        x2="512"
        y1="-19850"
        y2="-19850"
        gradientTransform="matrix(1 0 0 -1 0 -19594)"
        gradientUnits="userSpaceOnUse"
    >
        <stop offset="0" stop-color="#31d8ff" />
        <stop offset="1" stop-color="#ff80ff" />
    </linearGradient>
    <path
        fill="url(#a)"
        d="M512 256c0 141.387-114.613 256-256 256S0 397.387 0 256 114.613 0 256 0s256 114.613 256 256zm0 0"
    />
    <path
        fill="#fff"
        d="m436.605 161.469-86.074-86.074c-5.86-5.86-15.355-5.86-21.215 0L75.395 329.316c-5.86 5.86-5.86 15.356 0 21.215l86.074 86.074A14.955 14.955 0 0 0 172.074 441c3.84 0 7.68-1.465 10.61-4.395l253.921-253.921c5.86-5.86 5.86-15.356 0-21.215zm-264.53 243.316-64.86-64.86 42.265-42.269 15.958 15.957a14.955 14.955 0 0 0 10.605 4.395c3.84 0 7.68-1.465 10.605-4.395 5.86-5.855 5.86-15.355 0-21.215l-15.957-15.957 42.27-42.265 15.957 15.957a14.96 14.96 0 0 0 10.605 4.39c3.836 0 7.676-1.464 10.606-4.39 5.86-5.86 5.86-15.356 0-21.215l-15.957-15.957 42.27-42.266 15.956 15.957c2.93 2.926 6.766 4.395 10.606 4.395s7.68-1.469 10.605-4.395c5.86-5.859 5.86-15.355 0-21.214l-15.957-15.958 42.27-42.265 64.863 64.86zm0 0"
    />
</svg>