Sorry Charles, but to be perfectly accurate here, Ernesto Colnago calls it a "flower," and said he uses it to commemorate a win in The Primavera (Milan-San Remo).
Chuck Schmidt just back from 65 miler on De Rosa South Pasadena, Southern California
**********I guess I stand corrected. It sure always looked like a club card-suit symbol to me.. and from the history of decoration on italian frames I thought that's what it was.
c