That icon means that aya is bookmarked for that current surah. It is UNIQUE for every surah. After enabling for example aya 20 in Surah Al-Baqarah, the next time you open this surah, the app will automatically jump to aya 20. This applies to all other surahs too with its own bookmarked aya.
That icon means the aya is marked as a reading progress. It is UNIQUE throughout the Quran. After enabling this for example aya 7 in surah An-Nisa’, the next time you tap on the same icon on the top right of the surah selection page, it will jump straight to surah An-Nisa’ aya 7.
means a surah is favored. The app will always sort any favorite surah top of the list