LibreTube/app/src/main/res/drawable/ic_pinned.xml

<vector xmlns:android="http://schemas.android.com/apk/res/android"
    android:width="24dp"
    android:height="24dp"
    android:tint="?attr/colorControlNormal"
    android:viewportWidth="24"
    android:viewportHeight="24">
    <path
        android:fillColor="@android:color/white"
        android:fillType="evenOdd"
        android:pathData="M16,9V4l1,0c0.55,0 1,-0.45 1,-1v0c0,-0.55 -0.45,-1 -1,-1H7C6.45,2 6,2.45 6,3v0c0,0.55 0.45,1 1,1l1,0v5c0,1.66 -1.34,3 -3,3h0v2h5.97v7l1,1l1,-1v-7H19v-2h0C17.34,12 16,10.66 16,9z" />
</vector>