[1] Although the non-arboreal primary meanings of this letter name are well established, one of the arboreal glosses for this name in the Auraicept na n-Éces is cairtheand "mountain-ash", i.e. "rowan" (Modern Irish caorthann).
The associated verse is : lí súla "lustre of eye" (from the Bríatharogam Morann mic Moín).
The Auraincept interprets this as "delightful to the eye is luis, i.e. rowan, owing to the beauty of its berries".
[4][5] While medieval and modern neopagan arboreal glosses (i.e. tree names) for the Ogham have been widely popularised (even for fade whose names do not translate as trees), the Old Irish In Lebor Ogaim (the Ogam Tract) also lists many other word values classified by type (e.g. birds, occupations, companies) for each fid.
fili) or poets of this period learned around one hundred and fifty variants of Ogham during their training, including these word-list forms.