Unlike Rugby Soccer (football) has only a few hand signals.
For a visual reference see related link
Referees in football, basketball and soccer use a whistle for various signals.
i think there are four referees.
There are four referees in a baseball game.
NHL Referees make $127,000 a season
3 referees are in soccer and football
They are technically called assistant referees.
There are no referees in ballet. There are instructors. At competitions there are judges.
It is either the F.A, The U.E.F.A or F.I.F.A.
They are senior referees that have been given additional training in order to be able to objectively evaluate other referees and give them useful feedback in order to improve.
Referees do not wear any numbered jerseys.
No, both men and women can be referees in basketball
Referees are needed to see if the match is fairly played and to help if someone is injured.