I think I found my new favourite character, superseding the wonderful interrobang(‽):
Per aspera ad astra
There is a historical symbol I really love. It’s a cousin of @—the “commercial at” symbol that found a new life with the internet—but it comes with a more tragic history.
The symbol I love, known as “per,” was once its exact counterpart: you could buy 5 apples @ 10 cents an apple, or pay 10 cents ⅌ apple. ⅌ was more generic and thus potentially more useful than its more specific siblings percent (%) and permille (‰). And, at least in my opinion, it felt more beautiful than the ampersand (&).
via: When fonts fail