Many of the guys I've worked with in this area will do the fist thing to indicate we have 5 and 5 before a throw-in. We like it better than just making eye contact and nodding, or pointing and nodding.

Some guys I've worked with, when there's a minute or just under a minute left, will hold up one finger in the air to indicate such. When it gets down to the potential last second shot, the trail will pat his head to indicate he knows he has it.

Important thing is pregaming what you will use. I know the mechanics are not FED prescribed, but the state associations we work under has never come down on us about it because they would prefer communication rather than chaos.