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The only signals I use are a hand patting on my chest to indicate that we are under a minute and I have the clock. I only do this for NFHS games. In pre-game we discuss who has the clock when and this is simply a confirmation of that on the floor. For college, my supervisors have told me that everyone should know how much time is left and who has the clock without having to give a signal to anyone. Having been told about it once was all it took if you know what I mean. As for tightening/loosening up calls, that is usually a verbal communication during a time out, intermission, halftime, etc. Some of the veterans I ref NFHS with use the patting of the head (i.e. shot clock violation signal) to indicate who has the clock. That drives me crazy!!! I seen others point at the clock as well. We have followed the points of emphasis this year to only use approved federation mechanics.
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