https://www.reddit.com/r/BringBackThorn/comments/8exhy3/so_what_is_%C3%BE_and_why_are_we_bringing_it_back/
Apr 25, 2018 · Bring Back Þ is a subreddit for þe movement to reintroduce þe letter Þ, pronounced "thorn," an Old English letter representing þe th sound þat fell out of use