What sign did God set in the sky as the covenant after Noah’s Flood?

After Noah’s Flood, Genesis says God set a rainbow in the clouds as the sign of the covenant.

Genesis 9 describes a covenant involving God, Noah, his descendants, and every living creature. The rainbow is presented as a visible reminder that the waters would not again become a flood destroying all life. In the story, it functions as a sign of the covenant rather than merely as a weather observation.

The rainbow’s biblical appearance is often connected with later religious and cultural symbolism. It should not be confused with the olive leaf, which signaled that land was re-emerging before Noah left the ark. The rainbow appears afterward, when Genesis describes the covenant and its promise.