The inscription, "Or do Breasal", is the Old Irish formula meaning simply "a prayer for Breasal", the kind of petition that was once scratched or incised onto stone across monastic Ireland in the hope that readers would pause and intercede. What makes this slab unusual is not the prayer alone but the density of symbolic language surrounding it. On one face of the cross runs the inscription; on the other are the Greek letters alpha and omega, followed by IHS and XPS, the Chi-Rho derived Christos monogram rendered with an Irish P, a small orthographic detail that signals how insular scribal traditions adapted Continental Christian abbreviations into their own visual vocabulary.

The slab was found at Reefert Church in 1875 during repair work at that site, one of several early ecclesiastical remains in the Glendalough valley, which was known historically as Sevenchurches after the cluster of monastic buildings gathered there. As described by the architectural historian Harold Leask, it measures approximately 1.65 metres by one metre and is carved in shallow relief. The central cross has expanded terminals and an expanded centre set within a frame, with triquetras, three-cornered interlace knots, filling the expansions at the upper and lower ends, and the side arms of the cross looped in the same triquetra fashion. This layering of geometric knotwork with liturgical text and Greek letters reflects the characteristic visual language of Irish monastic stone carving, where Latin learning, Greek borrowing, and native ornamental tradition were woven together without apparent contradiction. After its discovery the slab was moved to St Kevin's Church for safekeeping, and by 2005 it was displayed on a wall inside the Visitor Centre.

Visitors to Glendalough who look for it in the Visitor Centre rather than among the outdoor ruins may find it easier to examine closely than many comparable carved stones, which are often weathered or positioned at a distance. The shallow carving rewards careful looking; the triquetras and the lettering are not immediately obvious from a distance, but become legible once the eye adjusts to the low relief.