Generally, in football, stars are worn around the crest of the jersey to indicate championships won in different leagues. In the case of the Manchester United football club, however, the three stars were added in 1997 as decoration to give the crest a continental feel.
The entire crest consists of an eagle behind a shield, along with the Latin phrase "Superbia In Proelio" below the shield; this translates into the phrase "Pride In Battle." The home colors of the team are blue and white, which are represented on the shield. These colors are a tradition of unknown origin since at least 1892.