It's possible that:
* You may be thinking of a different word. Double-check your spelling.
* It's a name or acronym. LAU could be a shortened form of a name, or it could be an acronym for something else.
* It's a word from a different language. "Lau" might be a word from another language that is being used in Hawaii.
Please provide more context if you can, such as where you heard or saw the word "LAU". This will help me understand what you are asking and provide a more accurate answer.