Muin

Muin 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 M and belongs to the third (Aicme Muine) 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; Muin is linked to the vine, from which its letter-name derives.

The divinatory use of ogham, here the sense of prophecy and release, 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 third family of ogham changes the geometry. Where the first two families cut strokes beside the line, the third cuts them through it.

How the letter is formed

Muin opens the third family, Aicme Muine, and is cut as one stroke crossing the line at an angle. A single oblique stroke through the arris is unmistakable at a glance, which is why the third family is the easiest of the four to identify on a weathered stone even when the count is uncertain.

Four geometries, not four positions

The four families are distinguished by how the strokes meet the line rather than by where they sit along it: beside it on one side, beside it on the other, across it obliquely, and across it square. That choice makes the system robust. A stroke that crosses the line cannot be mistaken for one that does not, however the reader is standing, which is precisely the ambiguity that troubles the first two families.

The sound

Muin carries the value M. It appears throughout the surviving corpus of orthodox inscriptions, which are almost all personal names in the genitive case, cut on standing stones in Ireland and in Irish-settled parts of Wales, Scotland and the Isle of Man, and dated on linguistic grounds to roughly the fourth to the sixth centuries.

The vine attached to this letter comes from the manuscript glosses. A vine is not native to Ireland, which is one of several reasons the tree glosses are read as a learned scheme rather than as a record of a living association, and the atlas treats that layer separately.