Im sorry to be a party pooper but though Linking Sigil is also mentioned in the article but that's not what the article is refering/asking about.
But the rest of the article is concerned with how mysterious the symbol is, and how no one knows where it came from.
A clue: anyone can register a symbol for a surprisingly small fee.
A question: why would the sigil be mentioned in an addendum but not in the article proper?
Anyway, it's pretty obvious that GP had a premonition this morning, with a pay off.
A unicode symbol? I want a symbol! How much are we talking about?
If you do, can you please tack on symbols for following external links, space bar symbol, and all the other miscellaneous internet adjacent characters I always have to reach to Fontawesome for?