It measures only around eighteen centimetres tall and sixteen wide, closer to the size of a large book than any monument, yet it carries the incised outline of a cross arm and, below that, the partial trace of a single letter beneath a horizontal line. That combination, a Christian symbol alongside what appears to be an inscription, suggests the fragment once belonged to a cross-slab, a category of early medieval carved stone that typically marked graves or commemorated individuals, often with both a cross and a name or dedication. Whatever the original slab looked like, only this corner of it survives, and whoever built it into the wall did so without much ceremony, turning it the wrong way up.

The stone came to light during an excavation at the site in 1944, recorded by Duignan that same year. Toureen Peakaun is itself a site of considerable age, a ruined church associated with early Christian activity in Tipperary, and it would not be unusual for a place of that kind to accumulate carved stonework over centuries, some of it eventually pressed into service as plain building material when the original meaning or context had been forgotten. Okasha and Forsyth, writing in 2001, catalogued the fragment carefully, noting its dimensions, the partial cross, and the tantalising letterform beneath the horizontal stroke. What that letter once spelled out, or who it once named, remains unknown.