How many numbers have the Pittsburgh Penguins retired?

The Red Wings have a total of 8 retired numbers (only 6 banners actually hang at Joe Louis Arena). These numbers include 1 (Sawchuck), 6 (Aurie), 7 (Lindsay), 9 (Howe), 10 (Delvecchio), 12 (Abel), 16 (Konstantinov), and 19 (Yzerman).