Bulanglang - is the term of Sabangan folks for rainbow. To some, they call it Atindulangan and Ababfungarngar. I don't know but I'm sure other native towns have their distinct term also for rainbor. Anyway, this rainbow has a significant meaning according to the Bible:

What did the rainbow mean after the flood?
After the flood, God made a covenant with Noah and all his descendants that never again would the human family be threatened with total annihilation by flood. The sign God gave Noah to assure him of this covenant was the rainbow. Noah said: "Whenever the rainbow appears in the clouds, I will see it and remember the everlasting covenant between God and all living creatures of every kind on the earth." (Genesis 9:15-16)