What does advantage + vs # mean?

I'm looking through a winning game.
Advantage varies from +14 to #9 ... what does the # mean?

https://lichess.org/hqrKw2wT#39

I'm looking through a winning game. Advantage varies from +14 to #9 ... what does the # mean? https://lichess.org/hqrKw2wT#39

Checkmate in 9.

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