Board Game Arena

When looking at the statistics for this game, I see several lines that say
Nb Placed Tiles: Green
Nb Placed Tiles: Animal Houses
etc...

What does "Nb" stand for? I searched around the site but couldn't find anything telling me what that meant.

My guess: number

That's a good guess! Personally I'd have used "#" like "# of Placed Tiles: Green" but then people today would be asking "What does Hashtag Placed Tiles: Green" mean?