Is there a way to "@ spam" the entire Trello board, similar to @room on Slack?
Can you elaborate what you mean by Room?
If by that you mean Board then you can use @board to notify everyone in the board.
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Sorry, I did mean board (updated the question). Was taking the Slack analogy too literally! @board is good, thanks. – mahemoff Apr 14 '16 at 10:04