navigation/drawable-anydpi-v21/ic_unfold_more_black_24dp.xml

<vector xmlns:android="http://schemas.android.com/apk/res/android"
        android:width="24dp"
        android:height="24dp"
        android:viewportWidth="24.0"
        android:viewportHeight="24.0">
    <path
        android:fillColor="#FF000000"
        android:pathData="M12,5.83L15.17,9l1.41,-1.41L12,3 7.41,7.59 8.83,9 12,5.83zM12,18.17L8.83,15l-1.41,1.41L12,21l4.59,-4.59L15.17,15 12,18.17z"/>
</vector>