Sowilō (rune)

Sowilo (*sōwilō), meaning "sun", is the reconstructed Proto-Germanic language name of the s-rune (ᛊ, ᛋ).

The letter is a direct adoption of Old Italic (Etruscan or Latin) s (𐌔), ultimately from Greek sigma (Σ). It is present in the earliest inscriptions of the 2nd to 3rd century (Vimose, Kovel).

The name is attested for the same rune in all three Rune Poems. It appears as Old Norse and Old Icelandic Sól and as Old English Sigel.

The Germanic words for "Sun" have the peculiarity of alternating between -l- and -n- stems, Proto-Germanic *sunnon (Old English sunne, Old Norse, Old Saxon and Old High German sunna) vs. *sōwilō or *sōwulō (Old Norse sól, Gothic sauil, also Old High German forms such as suhil). This continues a Proto-Indo-European alternation *suwen- vs. *sewol- (Avestan xᵛə̄ṇg vs. Latin sōl, Greek helios, Sanskrit surya, Welsh haul, Breton heol, Old Irish suil "eye"), a remnant of an archaic heteroclitic declension pattern that remained productive only in the Anatolian languages.^{[citation needed]}

The Old English name of the rune, written sigel (pronounced /ˈsɪ.jel/) is most often explained as a remnant of an otherwise extinct l-stem variant of the word for "Sun" (meaning that the spelling with g is unetymological), but alternative suggestions have been put forward, such as deriving it from Latin sigillum (assuming that the y is the unetymological element instead).

The Elder Futhark s rune is attested in main two variants, a "Σ shape" (four strokes), more prevalent in earlier (3rd to 5th century) inscriptions (e.g. Kylver stone), and an "S shape" (three strokes), more prevalent in later (5th to 7th century) inscriptions (e.g. Golden horns of Gallehus, Seeland-II-C).

The Younger Futhark Sol and the Anglo-Saxon futhorc Sigel runes are identical in shape, a rotated version of the later Elder Futhark rune, with the middle stroke slanting upwards, and the initial and final strokes vertical.^{[citation needed]}

The Anglo-Saxon runes developed a variant shape (ᚴ), called the "bookhand" s rune because it is probably inspired by the long s (ſ) in Insular script. This variant form is used in the futhorc given on the Seax of Beagnoth.^{[citation needed]}