What is Polite prefix?

"Polite prefix" is not a standard grammatical term. It seems like you might be asking about words that are added to the beginning of other words to make them sound more polite or formal.

There are two possibilities:

1. Formal prefixes: These are prefixes like "re-", "un-", "pre-", "mis-", "co-", "de-" etc., which can be used to create new words and may sound more formal than the original words.

2. Courtesy phrases: These are phrases like "please", "thank you", "excuse me", "could you", "would you", etc., that are used to make requests or express gratitude more politely.

If you provide more context about what you're looking for, I can provide a more specific answer.