Ailm

Ailm is a letter of ogham, the earliest form of writing in the Irish language, cut as sets of strokes across a central line. It stands for the sound A and belongs to the fourth (Aicme Ailme) of the four aicme, the groups of five into which the twenty principal letters are divided.

Letter, tree and later meaning

Ogham is a genuine antiquity: some four hundred inscriptions survive, most on standing stones in Ireland and western Britain, cut between roughly the fourth and sixth centuries. Each letter also bears a name, and medieval Irish scholars glossed many of those names with trees and with word-kennings; Ailm is linked to the silver fir or pine, from which its letter-name derives.

The divinatory use of ogham, here the sense of vision and perspective, is not attested in the early inscriptions. The reading of ogham as an oracle, and much of the elaborate tree-lore attached to it, belongs to the medieval glossary tradition and, above all, to the modern neo-druidic revival of the twentieth century. It is presented here as that later tradition, laid over a script whose first purpose was to record names in stone.

The fourth family of ogham holds the vowels, and it is cut differently from the other three.

How the letter is formed

Ailm opens the fourth family, Aicme Ailme, and is cut as one short stroke crossing the line at a right angle. On a standing stone these characters are often no more than notches on the arris itself, short enough that they need not run onto either face, which is why the fourth family is sometimes described as notched rather than stroked.

Vowels in one family

All five vowels sit together in the fourth family, in the order A, O, U, E, I. That is neither the Latin order nor an order suggested by the sounds, and it is one of the pieces of evidence in the long argument about how the ogham sequence was arrived at. Grouping the vowels and giving them a distinct geometry is, by contrast, an obviously practical decision: a reader scanning a stone can pick out the vowel skeleton of a word before working through the consonants.

The sound

Ailm carries the value A. It is frequent in the surviving corpus of orthodox inscriptions, which consist almost entirely of personal names in the genitive case, cut in Ireland and in Irish-settled parts of Britain and dated on linguistic grounds to roughly the fourth to the sixth centuries.

The silver fir attached to this letter belongs to the manuscript gloss tradition and is recorded separately here.