Iodhadh

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

Iodhadh is the Irish name of the twenty-fifth letter of the Ogham alphabet, ᚔ. In Old Irish, the letter name was Idad. Its phonetic value is [i].

The original meaning of the letter name is unknown, but it is likely influenced by Edad, much like Gothic pairþra, qairþra, together with which it forms the coda of the Briatharogaim.

The "arboreal" glossators assign ibhar "yew".