google-material-design-icons/android/av/stop/materialiconsround/black/res/drawable/round_stop_24.xml

<vector xmlns:android="http://schemas.android.com/apk/res/android"
    android:width="24dp"
    android:height="24dp"
    android:viewportWidth="24"
    android:viewportHeight="24"
    android:tint="?attr/colorControlNormal">
  <path
      android:fillColor="@android:color/white"
      android:pathData="M8,6h8c1.1,0 2,0.9 2,2v8c0,1.1 -0.9,2 -2,2H8c-1.1,0 -2,-0.9 -2,-2V8c0,-1.1 0.9,-2 2,-2z"/>
</vector>