Ruis (letter)

Ogham letters ᚛ᚑᚌᚐᚋᚁᚂᚃᚓᚇᚐᚅ᚜
Aicme Beithe ᚛ᚐᚔᚉᚋᚓᚁᚂᚃᚄᚅ᚜			Aicme Muine ᚛ᚐᚔᚉᚋᚓᚋᚌᚎᚏ᚜
ᚁ	[b]	Beith	ᚋ	[m]	Muin
ᚂ	[l]	Luis	ᚌ	[ɡ]	Gort
ᚃ	[w]	Fearn	ᚍ	[ɡʷ]	nGéadal
ᚄ	[s]	Sail	ᚎ	[st], [ts], [sw]	Straif
ᚅ	[n]	Nion	ᚏ	[r]	Ruis
Aicme hÚatha ᚛ᚐᚔᚉᚋᚓᚆᚇᚈᚉᚊ᚜			Aicme Ailme ᚛ᚐᚔᚉᚋᚓᚐᚑᚒᚓᚔ᚜
ᚆ	[j]	Uath	ᚐ	[a]	Ailm
ᚇ	[d]	Dair	ᚑ	[o]	Onn
ᚈ	[t]	Tinne	ᚒ	[u]	Úr
ᚉ	[k]	Coll	ᚓ	[e]	Eadhadh
ᚊ	[kʷ]	Ceirt	ᚔ	[i]	Iodhadh
Forfeda ᚛ᚃᚑᚏᚃᚓᚇᚐ᚜ (rare, sounds uncertain)			᚛ᚕᚖᚗᚘᚚᚙ᚜
ᚕ	[ea], [k], [x], [eo]	Éabhadh
ᚖ	[oi]	Ór
ᚗ	[ui]	Uilleann
ᚘ	[ia]	Ifín	ᚚ	[p]	Peith
ᚙ	[x], [ai]	Eamhancholl

Ruis (ᚏ) is the fifteenth letter of the Ogham alphabet, derived from ruise "red". Its Proto-Indo-European root was *h₁reudʰ- 'red'. Its phonetic value is [r].