1. In cryptocurrency discussions:

"Not coin" might be used informally to describe something that is not a cryptocurrency token or coin.

Example: If someone says “That’s not a coin,” they might mean the item in question is not a tradeable crypto asset like Bitcoin or Ethereum.

It could also imply that the thing is a tokenized asset, NFT, or utility that doesn’t function like a traditional cryptocurrency.

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2. In general language:

Literally, "not coin" just means anything that is not a coin — like paper money, digital credit, or non-monetary items.

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3. In Binance Word of the Day (WOTD) game:

If you're playing Binance's WOTD and the clue says "Not coin", it probably means the correct word is not the name of a crypto coin — it could be a concept like “block,” “swap,” “chart,” or “asset.”