>>919125
It's the special unicode character u+202E (RLO) (=Right-To-Left Override)
It reverses any text following it, and it spills over other html tags too, it's an huge mess. If you use that special character into the "Subject" field, it's going to reverse the whole post header. (it has no effect inside the email field)
This site board doesn't properly escape that character, as it should instead for all special characters.
https://unicode-explorer.com/c/202E
https://superuser.com/questions/47420/insert-unicode-characters-via-the-keyboard
Generating that character by pure windows seems like an hassle, it's a bit more easy with notepad++
https://superuser.com/questions/576431/notepad-inserting-special-unicode-characters-in-utf-8
notepad++ --> run --> charmap --> find the character U+202E --> copy --> paste inside np++
I got my copy of that character by just copying raw html text from inspecting a post from /AM/ where this character was first used, and then pasting that text into notepad++, which allowed me to see all the special characters normally hidden, including that [RLO] char.

I'm placing the RLO under this row, between the arrows ---><---, maybe you can copy it from the post without using html inspect.
--->‮<---
(the right arrow was reversed by RLO, the RLO is still between the two arrows)

Once you have that special character saved somewhere, where you can see it, you can just copy paste it whenever you want.