'Rainbow' in the Bible

The appearance of the brilliant light all around was like that of a rainbow in a cloud on a rainy day. This was the appearance of the form of the Lord’s glory. When I saw it, I fell facedown and heard a voice speaking.

and the One seated looked like jasper and carnelian stone. A rainbow that looked like an emerald surrounded the throne.

Then I saw another mighty angel coming down from heaven, surrounded by a cloud, with a rainbow over his head. His face was like the sun, his legs were like fiery pillars,