Andy, I would hazard a guess that the officials using that "safe" signal only officiate HS volleyball since there is not any "safe" signal used in any of the other volleyball rules codes (NCAA & USAV/FIVB) and they do not belong to an officials association having members who ref the other rules codes. Sounds like a case of the blind leading the blind. However, when you encounter the situation, ask the official why he used that signal and where he learned to use it since there is not any rules book or case book justification.
As Felix posted, it is something to avoid. It does not serve any useful purpose. If there is a fault, blow the whistle. When you use signal 7 (Legal Attack), you are conveying that you saw either the ball partially below the top of the net or the player behind the attack line when the ball was contacted. A "safe" sign is not an approved signal under any rules code and indicates nothing.
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Jan G. Filip - San Jose, CA
EBVOA Rules Interpreter Emeritus
NCS Volleyball Officials Coordinating Committee Recorder
CIF State Volleyball State Championships Referee (2005), Scorekeeper (2006-2007) & Libero Tracker (2010)
PAVO State Referee (2014) / PAVO Certified Scorekeeper (2014) / PAVO Certified Line Judge (2012)
USAV Junior National Referee (resigned 2013) / USAV National Scorekeeper (2014)
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