'Three' in the Bible

I saw, and I heard an eagle, flying in mid heaven, saying with a loud voice, "Woe! Woe! Woe for those who dwell on the earth, because of the other voices of the trumpets of the three angels, who are yet to sound!"

By these three plagues were one third of mankind killed: by the fire, the smoke, and the sulfur, which proceeded out of their mouths.

From among the peoples, tribes, languages, and nations people will look at their dead bodies for three and a half days, and will not allow their dead bodies to be laid in a tomb.

After the three and a half days, the breath of life from God entered into them, and they stood on their feet. Great fear fell on those who saw them.

I saw coming out of the mouth of the dragon, and out of the mouth of the beast, and out of the mouth of the false prophet, three unclean spirits, something like frogs;

The great city was divided into three parts, and the cities of the nations fell. Babylon the great was remembered in the sight of God, to give to her the cup of the wine of the fierceness of his wrath.

On the east were three gates; and on the north three gates; and on the south three gates; and on the west three gates.