Answer:
It is a mnemonic device
Step-by-step explanation:
They are any learning technique that aids information retention or retrieval in the human memory. In this case you can remember the colors of the rainbow using a simple phrase.
I believe it is a mnemonic device.
I don't exactly know how to explain it, or if I'm right. If you think that I am wrong, please don't put my answer down. I don't want you to fail school.
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