<svg xmlns="http://www.w3.org/2000/svg" width="512" height="512" viewBox="0 0 512 512">
  <!-- circular background matching app dark surface -->
  <circle cx="256" cy="256" r="248" fill="#0B0F1A"/>
  <!-- white lowercase "a" (bold, geometric) -->
  <text x="256" y="276" text-anchor="middle" dominant-baseline="middle"
        font-family="Inter, ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif"
        font-size="300" font-weight="800" fill="#ffffff">a</text>
</svg>