Blackboard

<svg
    xmlns="http://www.w3.org/2000/svg"
    width="512pt"
    height="512pt"
    viewBox="0 0 512 512"
>
    <linearGradient
        id="b"
        x1="74.981"
        x2="437.019"
        y1="74.981"
        y2="437.019"
        gradientUnits="userSpaceOnUse"
    >
        <stop offset="0" stop-color="#fdbf00" />
        <stop offset="1" stop-color="#ff9f00" />
    </linearGradient>
    <linearGradient
        id="c"
        x1="113.322"
        x2="398.678"
        y1="84.237"
        y2="369.593"
        gradientUnits="userSpaceOnUse"
    >
        <stop offset="0" stop-color="#913f02" />
        <stop offset="1" stop-color="#6f2e01" />
    </linearGradient>
    <linearGradient
        id="d"
        x1="134.407"
        x2="377.593"
        y1="105.322"
        y2="348.507"
        gradientUnits="userSpaceOnUse"
    >
        <stop offset="0" stop-color="#6f5654" />
        <stop offset="1" stop-color="#3e322e" />
    </linearGradient>
    <linearGradient
        id="e"
        x1="155.21"
        x2="230.278"
        y1="293.539"
        y2="368.607"
        gradientUnits="userSpaceOnUse"
    >
        <stop offset="0" stop-color="#ffd400" />
        <stop offset="1" stop-color="#fdbf00" />
    </linearGradient>
    <linearGradient id="a">
        <stop offset="0" stop-color="#e7e7e7" />
        <stop offset="1" stop-color="#d3d3d8" />
    </linearGradient>
    <linearGradient
        id="f"
        x1="134.006"
        x2="209.074"
        y1="188.23"
        y2="263.298"
        gradientUnits="userSpaceOnUse"
        href="#a"
    />
    <linearGradient
        id="g"
        x1="302.689"
        x2="377.757"
        y1="188.23"
        y2="263.298"
        gradientUnits="userSpaceOnUse"
        href="#a"
    />
    <linearGradient
        id="h"
        x1="234.915"
        x2="277.085"
        y1="195.286"
        y2="237.457"
        gradientUnits="userSpaceOnUse"
        href="#a"
    />
    <linearGradient
        id="i"
        x1="154.847"
        x2="357.153"
        y1="272.068"
        y2="474.374"
        gradientUnits="userSpaceOnUse"
    >
        <stop offset="0" stop-color="#b34f03" />
        <stop offset="1" stop-color="#913f02" />
    </linearGradient>
    <path
        fill="url(#b)"
        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="url(#c)" d="M256 100.402H97.156v253.024h317.688V100.402zm0 0" />
    <path
        fill="url(#d)"
        d="M256 121.488H118.242v210.856h275.516V121.488zm0 0"
    />
    <path
        fill="url(#e)"
        d="M245.457 353.426H140.031V321.8c0-17.442 14.188-31.63 31.625-31.63h42.172c17.442 0 31.629 14.188 31.629 31.63zm0 0"
    />
    <path
        fill="url(#f)"
        d="M203.285 269.086h-63.73l.484-11.008c.754-17.121 10.75-32.512 26.07-40.172 9.93-4.965 16.09-11.414 16.09-22.62 0-5.817-4.726-10.544-10.543-10.544s-10.543 4.727-10.543 10.543h-21.082c0-17.437 14.188-31.625 31.625-31.625 17.442 0 31.63 14.188 31.63 31.625 0 16.899-8.192 31.7-27.735 41.473A26.216 26.216 0 0 0 164.082 248h39.203zm0 0"
    />
    <path
        fill="url(#g)"
        d="M344.234 236.758c19.54-9.774 27.735-24.574 27.735-41.473 0-17.441-14.188-31.629-31.63-31.629s-31.624 14.188-31.624 31.63h21.082c0-5.817 4.726-10.544 10.543-10.544s10.543 4.727 10.543 10.543c0 8.988-4.992 17.07-13.043 21.098-19.57 9.785-28.367 24.629-29.117 41.695l-.485 11.008h63.73V248h-39.206a26.205 26.205 0 0 1 11.472-11.242zm0 0"
    />
    <path
        fill="url(#h)"
        d="M287.629 205.828v21.086h-21.086V248h-21.086v-21.086h-21.086v-21.086h21.086v-21.086h21.086v21.086zm0 0"
    />
    <path
        fill="url(#i)"
        d="M404.3 332.344H107.7c-17.5 0-31.63 14.125-31.63 31.625v31.629h359.86v-31.63c0-17.5-14.13-31.624-31.63-31.624zm0 0"
    />
</svg>