Question: Of which language was the inscription on a recently discovered spindle-whorl found in 1970 in Orkney, Scotland, which is considered an early medieval alphabet for the 6th century?

full_context: Document 1: 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 2: Spindle (textiles): A spindle is a straight spike usually made from wood used for spinning, twisting fibers such as wool, flax, hemp, cotton into yarn. It is often weighted at either the bottom, middle, or top, commonly by a disc or spherical object called a whorl, but many spindles exist that are not weighted by a whorl, but by thickening their shape towards the bottom, such as Orenburg and French spindles. The spindle may also have a hook, groove, or notch at the top to guide the yarn. Spindles come in many different sizes and weights depending on the thickness of the yarn one desires to spin.
Document 3: Yarmouth Runic Stone: The Yarmouth Runic Stone, also known as the Fletcher Stone, is a slab of quartzite that first came to the attention of the public in the early 19th Century. The stone appears to have an inscription carved into it, which some investigators, notably Henry Phillips, Jr., have interpreted as Norse runes. This has led to speculation that the Yarmouth, Nova Scotia area, in Canada, was visited by Viking explorers sometime around 1000 C.E. Many other theories have been put forward, including the possibility of a hoax or the inscription being a product of natural forces. The Stone is currently on display at the Yarmouth County Museum.
Document 4: Ardjachie Stone: The Ardjachie Stone is an uncut but decorated red sandstone boulder discovered by farmers in 1960 on the Ardjachie Farm in the Tarbat peninsula of Easter Ross. It now stands outside of the museum of Tain. On it are depicted several dozen cup or ring marks probably dating to the Bronze Age. It also has an inverted-L design with a wheel image above, both of probable Pictish origin. It therefore may be considered a Class I Pictish stone.
Document 5: 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 6: Buckquoy spindle-whorl: The Buckquoy spindle-whorl is an Ogham-inscribed spindle-whorl dating from the Early Middle Ages, probably the 8th century, which was found in 1970 in Buckquoy, Birsay, Orkney, Scotland. Made of sandy limestone, it is about 36 mm in diameter and 10 mm thick. It is the only known spindle-whorl with an Ogham inscription.
Document 7: 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 8: Pictish stone: A Pictish stone is a type of monumental stele, generally carved or incised with symbols or designs. A few have ogham inscriptions. Located in Scotland, mostly north of the Clyde-Forth line and on the Eastern side of the country, these stones are the most visible remaining evidence of the Picts and are thought to date from the 6th to 9th century, a period during which the Picts became Christianized. The earlier stones have no parallels from the rest of the British Isles, but the later forms are variations within a wider Insular tradition of monumental stones such as high crosses. About 350 objects classified as Pictish stones have survived, the earlier examples of which hold by far the greatest number of surviving examples of the mysterious Pictish symbols, which have long intrigued scholars.
Document 9: Old Irish: Old Irish (Old Irish: "Goídelc" ; Irish: "Sean-Ghaeilge" ; Scottish Gaelic: "Seann Ghàidhlig" ; Manx: "Shenn Yernish" ; sometimes called Old Gaelic) is the name given to the oldest form of the Goidelic languages for which extensive written texts are extant. It was used from 600 to 900. The primary contemporary texts are dated 700–850; by 900 the language had already transitioned into early Middle Irish. Some Old Irish texts date from the 10th century, although these are presumably copies of texts composed at an earlier time period. Old Irish is thus the ancestor of Modern Irish, Manx, and Scottish Gaelic.
Document 10: 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 11: Tartessian language: The Tartessian language is the extinct Paleohispanic language of inscriptions in the Southwestern script found in the southwest of the Iberian Peninsula: mainly in the south of Portugal (Algarve and southern Alentejo), and the southwest of Spain (south of Extremadura and western Andalusia). There are 95 of these inscriptions, the longest having 82 readable signs. Around one-third of them were found in Early Iron Age necropolises or other Iron Age burial sites associated with rich complex burials. It is usual to date them to the 7th century BC and consider the southwestern script to be the most ancient Paleohispanic script, with characters most closely resembling specific Phoenician letter forms found in inscriptions dated to "c." 825 BC. Five of the inscriptions occur on "stelae" with what has been interpreted as Late Bronze Age carved warrior gear from the Urnfield culture.
Document 12: Scottish gravestones: The Scottish or Lowland Scottish gravestone is unique to the north of the British Isles. The study of Scottish Lowland Gravestones is essential to the overall study of British monumental inscriptions. The level of symbolism and detail on Scottish stones reached a peak during the 18th century.
Document 13: Quoit brooch: The quoit brooch is a type of brooch found from the 5th century and later during the Anglo-Saxon settlement of Britain that has given its name to the Quoit Brooch Style to embrace all types of Anglo-Saxon metalwork in the decorative style typical of the finest brooches. The brooches take their modern name from the rings thrown in the game of quoits, and have the form of a broad ring, or circle with an empty centre, usually in bronze or silver (sometimes inlaid with silver or gold respectively), and often highly decorated. The forms are in a very low relief, so contrasting with other early Anglo-Saxon styles, with detail added by shallow engraving or punching within the main shapes. Dots or dashes are often used to represent fur on the animal forms, as well as lines emphasizing parts of the body. They are fixed with a single, straight hinged pin like those of other Anglo-Saxon ring or Celtic brooches and are further defined by the presence of a slot and pin-stops on the ring.
Document 14: 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 15: History of the Irish language: The history of the Irish language begins with the period from the arrival of speakers of Celtic languages in Ireland to Ireland's earliest known form of Irish, Archaic Irish, which is found in Ogham inscriptions dating from the 3rd or 4th century. After the conversion to Christianity in the 5th century, Old Irish begins to appear as glosses and other marginalia in Latin manuscripts, beginning in the 6th century. It evolved in the 10th century to Middle Irish. Early Modern Irish, otherwise known as Classical Irish, was a literary language that represented a transition between Middle and Modern Irish. It was used by writers in both Ireland and Scotland until the 17th century, in the course of which slowly but surely writers began writing in the vernacular dialects, Ulster Irish, Connacht Irish, Munster Irish and Scottish Gaelic. As the number of hereditary poets and scribes dwindled under British rule in the early 19th century, Irish became a mostly spoken tongue with little written literature appearing in the language until the Gaelic Revival of the late 19th century. The number of speakers was also declining in this period with monoglot and bilingual speakers of Irish increasing adopting only English: while Irish never died out, by the time of the Revival it was largely confined to the less Anglicised regions of the island, which were often also the more rural and remote areas. In the 20th and 21st centuries, Irish has continued to survive in Gaeltacht regions and among a minority in other regions. It has once again come to be considered an important part of the island's culture and heritage, with efforts being made to preserve and promote it.
ground_truth: Irish