ASCII Character þLatin small letter thorn
Thorn or þorn (Þ, þ) is a letter in the Old English, Gothic, Old Norse, Old Swedish, and modern Icelandic alphabets, as well as Middle Scots and some dialects of Middle English. It was also used in medieval Scandinavia, but was later replaced with the digraph th, except in Iceland, where it survives. The letter originated from the rune ᚦ in the Elder Fuþark and was called thorn in the Anglo-Saxon and thorn or thurs in the Scandinavian rune poems. It is similar in appearance to the archaic Greek letter sho (ϸ), although the two are historically unrelated. The only language þ is still currently in use in is Icelandic. In typography, the lowercase thorn character is unusual in that it has both an ascender and a descender (other examples are the lowercase Cyrillic ф, and, in some [especially italic] fonts, the Latin letters f and ſ [long s]).