A name specially applied to certain varieties of commemorative monuments (usually rough-hewn slabs or boulders, and in a few cases well-shaped crosses) of early Christian date found in various parts of the British Isles, bearing lettered and symbolic inscriptions of a rude sort and ornamental designs resembling those found on Celtic MSS. of the Gospels; lettered inscriptions are in Latin, Ogam (q. v .), and Scandinavian and Anglican runes, while some are uninscribed; usually found near ancient ecclesiastical sites, and their date is approximately fixed according to the character of the ornamentation; some of these stones date as late as the 11th century; the Scottish stones are remarkable for their elaborate decoration and for certain symbolic characters to which as yet no interpretation has been found.