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Hi and welcome to the forums.
The icon means that one of your tyres in either low on pressure, has a slow puntcure or is flat (but you'd know about that hopefully). I'd check the pressures of all tyres ASAP.
It could also be one of the tyre pressure monitoring sensors has stopped working / playing up. They have a habit of doing this.
Currently in dave_mezza2006's garage:
2014 Vauxhall Astra Limited Edition 1.4 16v VVT Turbo