It is one of two ogham stones that were once on this site, though the other, which also bore a carved cross, was removed in the mid-nineteenth century and eventually ended up in the National Museum of Ireland. The one that stayed behind is the more enigmatic of the pair.

Ogham is an early medieval script, used primarily in Ireland between roughly the fourth and seventh centuries, in which letters are represented by groups of notches and lines cut along the edge or face of a stone. Here, the inscription runs along the north-west angle of the stone and was read by the epigrapher R. A. S. Macalister in 1945 as CELI AVI VU, with further characters implied but unclear. Macalister himself noted that none of the vowels in his reading were certain, and where the stone is broken at the end of the inscription, a single score survives that could belong to any one of several letters, D, T, C, or Q among them. He also observed what appeared to be additional ogham scores on the north-east angle, but those marks are no longer visible at all. The stone measures 0.9 metres in height and 0.25 metres in width, modest proportions for an object that has survived at least partially legible for well over a thousand years. It has since been studied as part of the Ogham in 3D project, run by the School of Celtic Studies at the Dublin Institute for Advanced Studies, which uses digital scanning to record and analyse surviving inscriptions with a precision that earlier scholars, working by eye and hand, could not achieve. Whether that closer scrutiny has resolved Macalister's uncertainties is a question the fractured stone may not be able to answer.