In Genesis, God placed a rainbow in the clouds as the sign of the covenant made after Noah’s Ark flood.
Genesis 9:12–17 presents the rainbow as a visible reminder of the covenant between God, Noah, every living creature, and the earth. The associated promise is that a flood would not again destroy all life on earth. The sign is therefore connected to a universal promise, not only to Noah’s family.
The passage describes the rainbow as appearing in the clouds and uses it as a recurring reminder. It does not describe the rainbow as a physical object placed on the ark. Modern symbolism often emphasizes peace, hope, or diversity, while the Genesis context specifically emphasizes covenant and the restraint of destructive waters.