While we are all warned about touching our face during these days, it appears that while signals #23, 24,28 & 37 touch the head they do not touch the face. While curtailing the coronavirus is at the forefront of my mind, football is still wedged in my brain. My apologies to any of you that may find this post in bad taste.
Thanks for clarifying that Ralph, as you suggest
NO signal, as pictured on pages 94 & 95 of the NFHS Rule Book, shows any touching of the face.
Although some sections of the Country apparently offer audio assistance for Referee penalty signals, I suspect that is a distinct minority of locations, and visual communications, via signals, will persist, for some time, as the primary communication to teams and spectators.