Audi s2 Avant => red sign warning when the car is cold...

Hello everybody,

I m the owner of an Audi S2 Avant. Unfortunately I do not have the user manual (prior owner did not keep it). I m currently facing the following issue, when the car is cold, there is a warning light appearing on the dashboard (where you have the computer information) (red indicator with this sign : ((!)).

Does anybody knows what this sign means? Do you know what could be the problem?

Thanks a lot for you help and best regards!!

Julien