In American football referees use flags to indicate various penalties.
What number player they are to represent Australia.
Referees in football wear a referee uniform. Usually this consists of black pants with a black and white stripped shirt.
Referees do not wear any numbered jerseys.
Those are referees.
normally it would be black but sometimes depending on the players kit it could be either yellow shirt or green shirt
In American sports, the referees usually wear black and white striped shirts. In the NBA, the officials wear grey shirts.
He blows the whistle , and stops the game.
I have no idea but the buttons indicate that the shirt needs to be tucked into your trousers
The standard is English, but the referees will be able to speak a number of languages to better communicate with the players.
4 feferees. The main referee, two line referees, and the 4th referee who controls the board for substitutions.