Fearn (ᚃ) is the Irish name of the third letter of the Ogham alphabet, meaning "alder-tree".
In Old Irish, the letter name was fern [fʲer͈n͈], which is related to Welsh gwern(en), meaning "alder-tree(s)". Its Primitive Irish root was *wernā and its phonetic value then was [w]. Its Old Irish and modern phonetic value is [f].
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