We propose the symbol ⁂ to represent the fediverse.
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⁂ is called an asterism. In astronomy, it refers to groups of stars in the sky, akin to constellations. We suggest that it’s a very fitting symbol for the fediverse, a galaxy of interconnected spaces which is decentralised and has an astronomically-themed name. It represents several stars coming together, connecting but each their own, without a centre.
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@ is the symbol for e-mail. # is the symbol for hashtags. ☮ is the symbol for peace. ♻ is the symbol for recycling. ⁂ can be the symbol for the fediverse. ⁂ is standardised as Unicode U+2042, making it ready to copy and insert anywhere.
Git Repository: fediverse-symbol/fediverse-symbol
Its use looks contrived to me on the linked GitHub page. The comparison with @ and # is flawed because those symbols are part of the resource name, whereas here the symbol is superfluous. It’s like adding a 🌐 in front of every web URL.