They were previously called Linesmen, now they are officially called Assistant Referees, or Referee's Assistants.
They are technically called assistant referees.
The officiating officials in a volleyball game are called referees. The referees stay on the sidelines of the court.
The sidelines of a football ground is officially called "TOUCHLINE". It is the line which marks the playing area .
3 referees are in soccer and football
sidelines
yes
Referees
Before, if the soccer ball went out of bounds, the first person to get to the ball obtained possession. This is why the sidelines are called the touchlines.
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Soccer referees are graded by levels, not by classes. Informally, a referee might be considered "Class A" if they are certified International referees.
If you're talking about soccer referees, I don not believe so.
Sports that uses sidelines are baseball, criket, football, soccer and more.