Mini Ztar Space
From the Super Mario Wiki
Mini Ztar Spaces are a rare space found in Mario Party 9. They are the opposite of Mini Star Spaces. When landed upon, the Captain will lose Mini Stars (in other words, gain Mini Ztars) equal to the number imprinted on the space.
Although commonly found whenever taking a route provided by an Unlucky Space, Mini Ztar Spaces are also found on Toad Road, if the players fail to cross the gap between the mountains. Several are also present around the Blooper statue in Blooper Beach, but the players will only encounter them if someone lands on a certain Event Space that summons a whirlpool around the statue.