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?

The Vaṭṭeḻuttu alphabet, also spelled Vattezhutthu (literally "rounded script", Tamil: வட்டெழுத்து , "vaṭṭeḻuttu ", ] ; Malayalam: വട്ടെഴുത്ത് "vaṭṭeḻuttŭ ") is an abugida writing system originating from the ancient Tamil people of South India.  Developed from Tamil-Brahmi, Vatteluttu is one of the three main alphabet systems developed by Tamil people to write the Proto-Tamil language, alongside the ancient Grantha or Pallava alphabet and the Tamil script.  The syllabic alphabet is attested from the 6th century CE to the 14th century in present-day Tamil Nadu and Kerala states of India.  It was later supplanted by modern Tamil script and Malayalam script.  Vaṭṭeḻuttu replaced Tamil-Brahmi for writing Tamil after the 2nd century CE.  This rounded form of writing was also used in Kerala to write in Tamil as well as in proto-Malayalam and Malayalam language.  Currently, Malayalam uses the Malayalam script.  Inhabitants of Kuccaveli, located north of Trincomalee, used the Vaṭṭeḻuttu script between the 5th and 8th centuries, attested to on rock inscriptions found there.  Inscriptional records in Tamil date from 300 BCE to 1800.  Grantha was an alphabet in which extra letters were created specifically for Sanskrit words.  It was also a modified form of Tamil script to write Sanskrit granthas or books.  In Tamil, many of the letters which are found in Sanskrit do not exist. <SEP> 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. <SEP> 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. <SEP>  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. 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.