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?

full_context: Document 1: Alu (runic): The sequence alu () is found in numerous Elder Futhark runic inscriptions of Germanic Iron Age Scandinavia (and more rarely in early Anglo-Saxon England) between the 3rd and the 8th century. The word usually appears either alone (such as on the Elgesem runestone) or as part of an apparent formula (such as on the Lindholm "amulet" (DR 261) from Scania, Sweden). The symbols represent the runes Ansuz, Laguz, and Uruz. The origin and meaning of the word are matters of dispute, though a general agreement exists among scholars that the word represents an instance of historical runic magic or is a metaphor (or metonym) for it. It is the most common of the early runic charm words.
Document 2: Fearn (letter): Fearn is the Irish name of the third letter of the Ogham alphabet, ᚃ, meaning "alder-tree". In Old Irish, the letter name was Fern, which is related to Welsh "gwern(en)". Its Primitive Irish root was *"wernā" and its phonetic value then was [w]. Its Old Irish and modern phonetic value is [f].
Document 3: Somali Latin alphabet: The Somali Latin alphabet is an official writing script in the Federal Republic of Somalia and its constituent Federal Member States. It was developed by the Somali linguist Shire Jama Ahmed specifically for transcribing the Somali language, and is based on the Latin script. The Somali Latin alphabet uses all letters of the English Latin alphabet except "p", "v" and "z". There are no diacritics or other special characters, although it includes three consonant digraphs: DH, KH and SH. Tone is not marked and a word-initial glottal stop is also not shown. Capital letters are used for names and at the beginning of a sentence.
Document 4: E: E (named "e" , plural "ees") is the fifth letter and the second vowel in the modern English alphabet and the ISO basic Latin alphabet. It is the most commonly used letter in many languages, including Czech, Danish, Dutch, English, French, German, Hungarian, Latin, Latvian, Norwegian, Spanish, and Swedish.
Document 5: English language: English is a West Germanic language that was first spoken in early medieval England and is now a global "lingua franca". Named after the Angles, one of the Germanic tribes that migrated to England, it ultimately derives its name from the Anglia (Angeln) peninsula in the Baltic Sea. It is closely related to the Frisian languages, but its vocabulary has been significantly influenced by other Germanic languages, particularly Norse (a North Germanic language), as well as by Latin and Romance languages, particularly French.
Document 6: Western Latin character sets (computing): Several binary representations of character sets for common Western European languages are compared in this article. These encodings were designed for representation of Italian, Spanish, Portuguese, French, German, Dutch, English, Danish, Swedish, Norwegian, and Icelandic, which use the Latin alphabet, a few additional letters and ones with precomposed diacritics, some punctuation, and various symbols (including some Greek letters). Although they're called "Western European" many of these languages are spoken all over the world. Also, these character sets happen to support many other languages such as Malay, Swahili, and Classical Latin.
Document 7: Ogham: Ogham ( ; Modern Irish ] or ] ; Old Irish: "ogam" ] ) is an Early Medieval alphabet used to write the early Irish language (in the "orthodox" inscriptions, 1st to 6th centuries AD), and later the Old Irish language (scholastic ogham, 6th to 9th centuries). There are roughly 400 surviving orthodox inscriptions on stone monuments throughout Ireland and western Britain; the bulk of which are in southern Munster. The largest number outside Ireland are in Pembrokeshire, Wales.
Document 8: Ogham inscription: There are roughly 400 known ogham inscriptions on stone monuments scattered around the Irish Sea, the bulk of them dating to the 5th and 6th centuries. Their language is predominantly Primitive Irish, but a few examples record fragments of the Pictish language. Ogham itself is an Early Medieval form of alphabet or cipher, sometimes known as the "Celtic Tree Alphabet".
Document 9: Latin alphabet: The classical Latin alphabet, also known as the Roman alphabet, is a writing system originally used by the ancient Romans to write the Latin language. The Latin alphabet evolved from the visually similar Cumaean Greek version of the Greek alphabet, which was itself descended from the Phoenician abjad, which in turn was derived from Egyptian hieroglyphics. The Etruscans who ruled early Rome adopted the Cumaean Greek alphabet which was modified over time to become the Etruscan alphabet, which was in turn adopted and further modified by the Romans to produce the Latin alphabet.
Document 10: Vithkuqi alphabet: Vithkuqi script, also called Büthakukye or Beitha Kukju after the appellation applied to it by German Albanologist Johann Georg von Hahn, was an alphabet invented for writing the Albanian language between 1825 and 1845 by Albanian scholar Naum Veqilharxhi. Though the script is sometimes erroneuosly claimed to be named after its inventor, as in Carl Faulmann's "Das Buch der Schrift", the alphabet's name is derived from Vithkuq, a village in the Korçë region where Veqilharxhi was born. Vithkuqi script was specifically designed to be as religiously neutral as possible, avoiding the duplication of Greek, Latin, or Arabic characters. It had a near-perfect correspondence between letters and phonemes, but lacked characters for modern Albanian "gj", "rr", "xh", and "zh". The script never took hold because of its inventor's premature death and because of the prohibitive costs of cutting new type for the invented characters; nevertheless, a number of documents utilizing the script were published in the late 19th century. The script was eventually overwhelmed by the Greek, Arabic and Latin scripts it had been designed to supplant, the latter becoming the official one in 1909.
Document 11: Æ: 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.
Document 12: Old English Latin alphabet: 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.
Document 13: Anglo-Saxon runes: Anglo-Saxon runes are runes used by the early Anglo-Saxons as an alphabet in their writing. The characters are known collectively as the futhorc (or "fuþorc"), from the Old English sound values of the first six runes. The futhorc was a development from the 24-character Elder Futhark. Since the futhorc runes are thought to have first been used in Frisia before the Anglo-Saxon settlement of Britain, they have also been called Anglo-Frisian runes. They were likely used from the 5th century onward, recording Old English and Old Frisian.
Document 14: Caistor-by-Norwich astragalus: The Caistor-by-Norwich astralagus is a roe deer astragalus found in an urn at Caistor St. Edmund, Norfolk, England. The astragalus is inscribed with a 5th-century Elder Futhark inscription, reading raïhan "roe". The inscription is the earliest found in England, and predates the evolution of the specifically Anglo-Frisian Futhorc. As the urn was found in a cemetery that indicated some Scandinavian influence, it has been suggested that the astragalus may be an import, perhaps brought from Denmark in the earliest phase of the Anglo-Saxon settlement of Britain. The inscription is an important testimony for the Eihwaz rune and the treatment of Proto-Germanic "*ai". The "h" rune has the Nordic single-bar shape , not the Continental double-bar which was later adopted in the Anglo-Frisian runes.
Document 15: History of English: English is a West Germanic language that originated from Anglo-Frisian dialects brought to Britain in the mid 5th to 7th centuries AD by Germanic invaders and settlers from what is now northwest Germany, west Denmark and the Netherlands, displacing the Celtic languages that previously predominated.
ground_truth: Æ