Other than what are shown in the CCA manual, you won't find a list or chart of signals. They vary widely, nearly crew by crew. For example, at 2:00 remaining in the 2nd and 4th periods, we signal each other with two fingers touching our shoulders (same as the baseball "two-out time play" signal), to remind us that we are in 2-minute timing rules. We may be the only crew in the country that uses that signal. Some crews may not signal at all. Similalry, signals between the H &L vary from no signals at all, to signals for all varieties of formations. Deep guys may have reminder signals for a variety of things; but, again, the specific signals and their meanings vary by crew. Many (most?) U's communicate with the H on penalty distance by holding up 1, 2, or 3 fingers for the distance, in increments of 5 yards per finger. Clock status reminders also vary, from simple finger twirls and crosssed wrists, to snapping of fingers, etc.
It really doesn't matter what signals you use, or even when you use signals. What matters is that your crew are all on the same page at the same time. Some crews don't need signals for that, and some rely heavily on signals. In reality, once any crew has worked a number of games together, they could probably do just fine without signals, but they help significantly with maintaining focus and concentration, and ensure a high level of crew communication.
