Creative symbols ...
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"One group of protestors printed the Friedmann equation, which governs the expansion of the universe - the name sounds like the words "freed man". Another protestor held up an exclamation mark on a red background: the sign on WeChat when a message can't be delivered." p.23.
World, Evading censors. The creative symbols of dissent, The Guardian, 30 November 2022, p.23.
Image: http://hyperphysics.phy-astr.gsu.edu/hbase/Astro/fried.html