google-material-design-icons/android/av/stop/materialiconsround/black/res/drawable/round_stop_20.xml

<vector xmlns:android="http://schemas.android.com/apk/res/android"
    android:width="20dp"
    android:height="20dp"
    android:viewportWidth="20"
    android:viewportHeight="20"
    android:tint="?attr/colorControlNormal">
  <path
      android:fillColor="@android:color/white"
      android:pathData="M12,14H8c-1.1,0 -2,-0.9 -2,-2V8c0,-1.1 0.9,-2 2,-2h4c1.1,0 2,0.9 2,2v4C14,13.1 13.1,14 12,14z"/>
</vector>