End of Period Signal

[slow whistle]

It is customary in our area for the covering official to signal the end of each period with a whistle - assuming others do this as well (bad assumption?), is there an accompanying hand signal that you use? It is one thing if you are waving off a shot attempt that comes after the horn, but what if you just have a player dribbling out the period? Just seems awkward to blow your whistle without any accompanying signal. Thanks for the input.