A runestone is typically a raised stone with a runic inscription, but the term can also be applied to inscriptions on boulders and on bedrock. The tradition began in the 4th century but most of them date from the late Viking Age, and it lasted into the 12th century.

The Wikipedia pages on runestoness are [1] and [2], while a list of runestones - primarily in Scandinavia - can be found on [3].

See also