<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100">
  <rect width="100" height="100" fill="#000000"/>
  <text x="50" y="75" font-family="Arial, sans-serif" font-size="60" font-weight="700" fill="#FFFFFF" text-anchor="middle">W</text>
</svg>