device/drawable-anydpi-v21/ic_signal_wifi_4_bar_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="M12.01,21.49L23.64,7c-0.45,-0.34 -4.93,-4 -11.64,-4C5.28,3 0.81,6.66 0.36,7l11.63,14.49 0.01,0.01 0.01,-0.01z"/>
</vector>