So, the letter thorn was an old letter used back in the old English. It's the most underrated letter in my opinion. It's the letter once used for the 'th' sound, IPA: /θ/. Þe letter hadn't been in use for quite a long time, and it's quite underrated. It was used in back in þe old English. Honestly, it's better þan oþer unused/abandoned letters. Anoþer þing is þat þe :Þ emoticon is way better þan þe :p or :b.