Premiere at the IAA 2001 in Frankfurt Signum2 Concept Car – A Glimpse into Opel's Future Dynamic good looks, versatility, convenience and in-car communications Rüsselsheim. Signum² is the name Opel has given to the innovative concept car that will be shown to the public for the first time at the Frankfurt International Motor Show (IAA) from September 13 – 23, 2001. The name underlines its relationship with the Signum prototype first seen at the…