Nion
the Irish name of the fifth letter of the Ogham alphabet
Nion (ᚅ) is the Irish name of the fifth letter (Irish "letter": sing.fid, pl.feda) of the Ogham alphabet, with phonetic value [n]. The Old Irish letter name, Nin, may derive from Old Irish homonyms nin/ninach meaning "fork/forked" and "loft/lofty". Nin is notable for being the old name that refers both to this specific letter, and to any of the Ogham letters in general. "Nin" is also an Irish word used for a grandma.
Interpretation
The glossators of the Ogam Tract and the Auraicept na n-Éces seem to refer to at least two Irish words nin, meaning "part of a weaver's loom", and "a wave". The corresponding adjective ninach is glossed as gablach and used as a synonym of cross, and the word seems to be roughly synonymous with gabul "fork, forked branch", and is thus a plausible base for a name for "Ogham letters", which (at least the consonants), look like forks or combs.
The second nin seems to be cognate with Welsh nen "roof, heaven", with a meaning of "loftiness", with an adjective ninach "lofty". The kennings are explained by the glossators that weavers' beams were erected as signs of peace.
The "arboreal" tradition claims the word as ash-tree, concluding that looms were made of ash-wood. In some instances, the association with ash-wood, which is best known as the raw material for spears, the kenning was amended to "destruction of peace", as in the Auraicept:Nin too is named from a tree, viz., ash, ut dicitur: A "check on peace" is nin, viz., ash, for of it are made the spear-shafts by which the peace is broken: or, A "check on peace" is ash-tree.
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