| Ogham letters | |||
| Aicme Beithe | Aicme Muine | ||
| ᚁ | Beith | ᚋ | Muin |
| ᚂ | Luis | ᚌ | Gort |
| ᚃ | Fearn | ᚍ | nGéadal |
| ᚄ | Sail | ᚎ | Straif |
| ᚅ | Nion | ᚏ | Ruis |
| Aicme hÚatha | Aicme Ailme | ||
| ᚆ | Uath | ᚐ | Ailm |
| ᚇ | Dair | ᚑ | Onn |
| ᚈ | Tinne | ᚒ | Úr |
| ᚉ | Coll | ᚓ | Eadhadh |
| ᚊ | Ceirt | ᚔ | Iodhadh |
| Forfeda | |||
| ᚕ | Éabhadh | ||
| ᚖ | Ór | ||
| ᚗ | Uilleann | ||
| ᚘ | Ifín | ᚚ | Peith |
| ᚙ | Eamhancholl | ||
- Note: This article contains special characters.
Luis (ᚂ) is the second letter of the Ogham alphabet, derived either from luise "flame" or from lus "herb". Its Proto-Indo-European root was either *leuk- 'to shine' or *leudh- 'to grow'. Its phonetic value is [l].
The Auraicept na n-Éces glosses the name as cairtheand "mountain-ash", i.e. "rowan" (Modern Irish caorthann). The associated verse is
- Li sula "lustre of eye"
The Auraincept interprets this as "delightful to the eye is luis, i.e. rowan, owing to the beauty of its berries".
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