Question: What is this grapheme still in use as a letter in some languages, including Danish, Norwegian, and Icelandic that the Old English Latin alphabet had?

Related documents: [0]  [DOC] Æ (minuscule: æ) is a grapheme named æsc or ash, formed from the letters "a" and "e", originally a ligature representing the Latin diphthong "ae". It has been promoted to the full status of a letter in the alphabets of some languages, including Danish, Norwegian, Icelandic, and Faroese. As a letter of the Old English Latin alphabet, it was called "æsc" ("ash tree") after the Anglo-Saxon futhorc rune ᚫ () which it transliterated; its traditional name in English is still ash . It was also used in Old Swedish before being changed to ä. Variants include Ǣ ǣ Ǽ ǽ æ̀. [END] 
[1]  [DOC] The Old English Latin alphabet—though it had no standard orthography—generally consisted of 24 letters, and was used for writing Old English from the 9th to the 12th centuries. Of these letters, 20 were directly adopted from the Latin alphabet, two were modified Latin letters (Æ, Ð), and two developed from the runic alphabet (Ƿ, Þ). The letters K, Q and Z were not in the spelling of native English words. [END]  
Answer: Æ
Æ