'Three' in the Bible

I heard what sounded like a voice from among the four living creatures, saying, "One day's ration of wheat for a day's wage, or three day's ration of barley for a day's wage! But don't damage the olive oil or the wine!"

Then I looked, and I heard an eagle flying overhead say in a loud voice, "How terrible, how terrible, how terrible for those living on the earth, because of the blasts of the remaining trumpets that the three angels are about to blow!"

By these three plagues the fire, the smoke, and the sulfur that came out of their mouths one-third of humanity was killed.

For three and a half days some members of the nations, tribes, languages, and nations will look at their dead bodies and will not allow them to be placed in a tomb.

But after the three and a half days, the breath of life from God entered them, and they stood on their feet. Those who watched them were terrified.

Then I saw three disgusting spirits like frogs come out of the mouth of the dragon, out of the mouth of the beast, and out of the mouth of the false prophet.

The great city was split into three parts, and the cities of the nations fell. God remembered to give Babylon the Great the cup of wine filled with the fury of his wrath.

There were three gates on the east, three gates on the north, three gates on the south, and three gates on the west.