Small enough to hold in two hands, measuring roughly 19 centimetres high and 14 centimetres wide, it carries on its visible face an incised equal-armed cross with expanded terminals, the kind of precise, deliberate mark that early medieval stonecutters used to signal something sacred or commemorative. What makes this fragment genuinely curious is what follows immediately after the cross: a letter, only slightly smaller than the cross itself, and then the beginning of a second. The rest of the inscription, whatever it once said, is gone. The slab is a fragment of something larger, its original form unknown.

The stone came to light during an excavation carried out in 1944, documented by Duignan and subsequently noted by Macalister in 1949. St Peakaun's is an early ecclesiastical site, and small incised cross-slabs of this type are associated with early Christian practice in Ireland, sometimes marking graves, sometimes serving devotional purposes within monastic enclosures. The cross form here, with its equal arms and splayed terminals, is consistent with early medieval lapidary work, though the fragmentary inscription places it in a rarer category. Scholars Okasha and Forsyth, writing in 2001, catalogued it as Toureen Peacaun 15, their description carefully noting what can be seen without speculating about what cannot.

The stone sits in the wall of the church rather than being displayed separately, which means it is encountered almost incidentally, part of the fabric of the building rather than set apart for inspection. The two surviving letters, stranded after their cross, are a reminder that early inscriptions were not always meant to outlast the communities that carved them.