I hadn't heard of this sign before.
https://en.wikipedia.org/wiki/Rabia_sign
Supporters state that the gesture is used to express solidarity with what they call "the thousands wounded, killed and burnt by the Egyptian army" during the dispersal of their sit-in. The origin of the sign is unknown.
@Oliver Schick started
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I hadn't heard of this sign before.
https://en.wikipedia.org/wiki/Rabia_sign