Iodhadh is the Irish

Irish language

Irish , also known as Irish Gaelic, is a Goidelic language of the Indo-European language family, originating in Ireland and historically spoken by the Irish people. Irish is now spoken as a first language by a minority of Irish people, as well as being a second language of a larger proportion of...

 name of the twenty-fifth letter of the Ogham

Ogham

Ogham is an Early Medieval alphabet used primarily to write the Old Irish language, and occasionally the Brythonic language. Ogham is sometimes called the "Celtic Tree Alphabet", based on a High Medieval Bríatharogam tradition ascribing names of trees to the individual letters.There are roughly...

 alphabet, . 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.

"Iodhadh" is also known by other names such as "Ioho", "Idad" and "Idho". Though there is never any mention of which is the correct name.

The "arboreal" glossators assign ibhar "yew

Taxus baccata

Taxus baccata is a conifer native to western, central and southern Europe, northwest Africa, northern Iran and southwest Asia. It is the tree originally known as yew, though with other related trees becoming known, it may be now known as the English yew, or European yew.-Description:It is a small-...

".