The scudetto (Italian for: "little shield") is a decoration worn by Italian sports clubs that won the annual championship of their respective sport in the previous season.
Later, it was adopted by the teams of other sports.
Sources generally agree that the inventor of the scudetto was the Italian poet and playwright Gabriele D'Annunzio. In his youth, D'Annunzio was a keen follower of football and in 1887 he bought in London a leather ball from the same manufacturer that supplied the Football League and would play football with his friends on the beach of his native Pescara.
In 1920, the former Austro-Hungarian city of Fiume (now the Croatian Rijeka) was annexed to Italy, D'Annunzio proposed that the local football team acknowledge supporting the Italian sovereignty over the city with a tricolored shield on its jerseys of (green, white and red).
In 1924, the Italian Football Federation approved the decision to honour the defending champion allowing them to wear the scudetto on their jerseys. Since then, the scudetto has become the symbol of the defending champions of every sports league in Italy.
The Italian rugby union championship which started in 1928 adopted the scudetto on a team's jersey to indicate a title holding team.