* A misspelling: Perhaps you meant "anos," which is the plural of "ano" in Spanish, meaning "year(s)."
* A foreign word: It could be a word from another language.
* A proper noun: It might be a person's name or a place name.
To understand what "Anos" means, please provide more context. For example:
* Where did you see or hear this word?
* What was the surrounding text or conversation?
With more information, I can help you figure out the meaning.