Substraction

<svg
    xmlns="http://www.w3.org/2000/svg"
    width="512"
    height="512"
    viewBox="0 0 24 24"
>
    <linearGradient
        id="a"
        x1="1"
        x2="23"
        y1="12"
        y2="12"
        gradientUnits="userSpaceOnUse"
    >
        <stop offset="0" stop-color="#87f1fc" />
        <stop offset=".256" stop-color="#7fd4fb" />
        <stop offset=".529" stop-color="#78bcfb" />
        <stop offset=".784" stop-color="#74aefa" />
        <stop offset="1" stop-color="#73a9fa" />
    </linearGradient>
    <path
        fill="url(#a)"
        d="M12 1a11 11 0 1 0 11 11A11 11 0 0 0 12 1zm6.5 13a2.5 2.5 0 0 1-2.046 2.454A2.5 2.5 0 0 1 14 18.5H8A2.502 2.502 0 0 1 5.5 16v-6a2.5 2.5 0 0 1 2.046-2.454A2.5 2.5 0 0 1 10 5.5h6A2.502 2.502 0 0 1 18.5 8zm-1-6v6a1.498 1.498 0 0 1-1 1.408V10A2.502 2.502 0 0 0 14 7.5H8.592A1.498 1.498 0 0 1 10 6.5h6A1.502 1.502 0 0 1 17.5 8zm-3.5.5H8A1.502 1.502 0 0 0 6.5 10v6A1.502 1.502 0 0 0 8 17.5h6a1.502 1.502 0 0 0 1.5-1.5v-6A1.502 1.502 0 0 0 14 8.5zm-1 5H9a.5.5 0 0 1 0-1h4a.5.5 0 0 1 0 1z"
    />
</svg>