Noah's symbol is an ark or a rainbow.
Now the earth was corrupt in God’s sight, and the earth was filled with violence. And God saw that the earth was corrupt; for all flesh had corrupted its ways upon the earth. And God said to Noah, ‘I have determined to make an end of all flesh, for the earth is filled with violence because of them; now I am going to destroy them along with the earth. Make yourself an ark of cypress wood; make rooms in the ark, and cover it inside and out with pitch.