At the professional level, most Assistant Referees carry matching flags. However, many basic starter sets for new referees have one orange and one yellow flag. The intended purpose of this is not clear, but two possibilities come to mind. First, one color might have been used to denote the "senior (or first) assistant referee". Another possibility is that each AR is expected to have the pair, and the referee could choose, based on lighting conditions or personal preference, which color the ARs should use.
Most flags have both orange and yellow components on the same flag, and come in matching pairs. The unmatched pair is still sold in starter kits today, but are rarely seen above the youth and recreational levels.
yellow
It usually is called a penalty and is showed by a yellow flag.
A yellow flag means you have injured a player,foul,just like football.
Yellow flag
In the game of soccer, a buzzer flag is a flag attached to a buzzer worn by the assistant referee, which causes a receiver to buzz, warning the referee of the flag's use.
In the end it's the referee and ONLY the referee who makes the call, but if a linesman sees something illegal on the field he can raise his flag to notify the referee that he has seen something and then tell the referee what he saw.
In a tournament, there are five referees. There are four flag referees and one main referee. The flag referees raise the flag with the color of the opponent scoring a point. The final decision is made by the main referee.
Flag football or touch football
flag football flag football
The cast of Epic Flag Football - 2012 includes: Jeremy Driver as Football Player - Team Black Aaron Geiger as Football Player - Team White Jenna Hale as Pregnant Quarterback Mary Vaughan as Football Player - Team White Benjamin Walter Jones as Referee Brandon Westbrook as Football Player - Team White Austin Wiseman as Football Player - Team White Henry Xavier Smith as Football Player - Team Black
yellow flag by itself means healthy yellow flag flow with another means quarantine
The hand closest to the referee. Depending where you are and which way you are facing. This allows the referee to better hear and see the flag when you raise it. Good luck.