Related to this, an interesting fact:
The first team in association football history to adopt a star was Juventus, who added one above their badge in 1958 to represent their tenth Italian Football Championship and Serie A title, at the time, the new national record.[1] This was an extension of the existing convention by which the reigning champions are entitled to display the scudetto on their shirts for the following season. The star was later formally adopted by some organisations as a symbol for ten titles, and the ratio of one star for ten titles has become the "most common" arrangement.
I note that Rangers are often ridiculed by other teams (surely not!!) for displaying 5 stars on our strip. Well we are just following protocol.