Allah that will gather mankind together against a Day and Allah assembled all for a Day of Assembly.
This word is repeated in the Holy Qur’an 3-times but used once only as the name of Allah.

Allah has said, Lord! Surely You are the One Who gathers men on a Day about which there is no doubt; surely Allah will not fail His promise. [3:9] AI-Jami' is an Attribute of Allah derived from jami', its root word, which means: to gather, assemble, horde, or combine. The Day of Gathering is the Day of Judgment. It is called so because Allah will gather on it the early generations of His creation and the last ones, the jinns and mankind, all the residents of the heavens and the earth, each and every servant of Allah and his deeds, every oppressor and those whom he oppressed, and every prophet and those to whom he was sent. He will also combine between the rewards of those who obeyed Him and the penalty of those who disobeyed Him.

The subject of jami', gathering or combining, is referred to in several verses of the Holy Our'an such as the following: Allah: there is no god but He; He will most certainly gather you together on the Resurrection Day; there is no doubt about it [4:87]. He has ordained mercy on Himself; most surely He will gather you on the Day of Resurrection, there is no doubt about it [6:12]. And on that Day, We will leave some of them in conflict with others, and the trumpet will be blown, so We will gather them all together [18:99]. Say: Our Lord will gather us together, then will He judge between us with the truth, and He is the greatest Judge, the all-Knowing

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source: weekly Mirror