There's a process for it. I'm not sure it costs anything but it's a bunch of paperwork. You have to justify what it's used for, why existing solutions don't work, etc. The working group is probably pretty reasonable, but I'm sure it's an involved process.
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?
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.