Threema-Android-mirror/app/src/main/res/drawable/ic_thumbscroller.xml

<vector xmlns:android="http://schemas.android.com/apk/res/android"
    android:width="40dp"
    android:height="64dp"
    android:viewportWidth="40"
    android:viewportHeight="64">
<path
      android:pathData="M33,58C35.4297,58 37.7507,57.6944 39.9985,57.1127C39.9985,57.1127 39.9985,2.8785 39.9985,2.8785C37.7603,2.3022 35.4182,2 33,2C17.536,2 5,14.536 5,30C5,45.464 17.536,58 33,58Z"
      android:strokeWidth="0.1"
      android:strokeColor="?attr/textColorSecondary"
      android:fillType="evenOdd"
      android:fillColor="?attr/quickscroll_background"/>
 <path
      android:pathData="M34,35l-6,6l-6,-6z"
      android:strokeLineJoin="round"
      android:strokeWidth="0.5"
      android:fillColor="?attr/textColorSecondary"
      android:fillType="nonZero"
      android:strokeColor="?attr/textColorSecondary"/>
  <path
      android:pathData="M34,26l-6,-6l-6,6z"
      android:strokeLineJoin="round"
      android:strokeWidth="0.5"
      android:fillColor="?attr/textColorSecondary"
      android:fillType="nonZero"
      android:strokeColor="?attr/textColorSecondary"/>
</vector>