[Mark T. DeNucci, Sr.]

Originally Posted by bob jenkins

No, it's not standard, nor is it in the manual.

It is done in some areas to tell the teams to stop dunking.

You're new (iirc) to officiating. Go watch some games and see if the other varsity officials do this. Follow their lead.

Bob:

Why would the officials in those areas want to advertise the fact they are coming onto the court so that the players can stop dunking? Nothing is more fun than to walk onto the court just as a player dunks that ball and to see his face when he sees you and he knows that you have caught him dunking and that he is going to get whacked. Sounding one's whistle takes on of the few and small pleasures out of officiating the game.

MTD, Sr.