Neon: Sometimes you can see the second rainbow outside the rainbow, which is slightly lighter than the first rainbow. The color sequence is ultraviolet and red, which is opposite to the rainbow. Rainbow: The original intention is also a natural phenomenon, that is, rainbows are also colorful, and the color order is red, orange, yellow, green, blue, indigo and purple from outside to inside. Neon: A colored lamp used to attract customers or decorate the night scene at night, so we use "neon" as the name of this lamp. Neon is a transliteration of English NEON.