Where does the crossed bracelets pose come from?

[Agent Z]

Historically, these types of salutes are derived from the military (the Roman salute) or from how how people treated the king and his delegates. Salutes are commonly used by armies because they are a ranked, authoritarian structures. In our modern culture, these sorts of salutes exist solely in the military, in the historical memory of authoritarian regimes or pop culture replicas of these regimes (the Empire from Star Wars) When I first saw Black Lives Matters activists doing that stupid Wakanda salute I genuinely got Fascist vibes off them because it clearly looks like a military salute.

There are salutes that aren't authoritarian or patriarchal (like greetings, or the raised fist) but when used in crowds they aren't used with the same uniformity. During Labour Day protests you aren't going to see mobs of people with a raised fist marching with the same organization as you would see during Bastille Day.

Which real life regime has used the crossed bracelets gesture? It's a huge leap of logic to call fascism for using what is essentially a harmless gesture that was shown in a movie.