The Essence
Al-Jaami' is the Gatherer. He brings together things that are dispersed, like clouds, hearts, or atoms. Ultimately, He is the One who will gather all of mankind together on the inescapable Day of Judgment.
In the Quran
رَبَّنَا إِنَّكَ جَامِعُ النَّاسِ لِيَوْمٍ لَا رَيْبَ فِيهِ
"Our Lord, surely You will gather (Jaami') the people for a Day about which there is no doubt. (Surah Ali 'Imran 3:9)"
In Your Duas
رَبَّنَا إِنَّكَ جَامِعُ النَّاسِ لِيَوْمٍ لَا رَيْبَ فِيهِ
"Our Lord, surely You will gather the people for a Day about which there is no doubt."
— Quran, Surah Ali 'Imran 3:9