thumb|250px|right|Runestone Sö 84 in Tumbo, Sweden.Södermanland Runic Inscription 84 or Sö 84 is the Rundata designation for a runic inscription on a Viking Age memorial runestone located in Tumbo, Södermanland County, Sweden, and in the historic province of Södermanland.
This inscription is on a granite runestone is 1.8 meters in height and consists of a Christian cross surrounded by a runic serpent text band. The place name Skyttingi in the runic text, sometimes read as Skytiki, refers to the modern hamlet of Skyttinge located in Tumbo parish.[1] The inscription is classified as being carved in runestone style KB, which is the designation used for runestones with crosses circled with a runic inscription.
The runic text indicates that the stone was raised as a memorial to someone's brother named Þorbjôrn and ends with a prayer for his soul. Although the memorial stone has a Christian cross on it, two of the personal names in the inscription include the Norse pagan god Thor as a theophoric name element. Þorbjôrn translates as "Thor's Bear" and Þorsteinn as "Thor's Stone."[2] The names in the Sö 84 inscription also reflect a common practice of that time in Scandinavia of repeating an element in a parent's name in the names of the children.[3] Here the Þor from the father's name, Þorsteinn, is repeated in the name of the son, Þorbjôrn, to show the family relationship.
× a...ʀ ...et * raisa * stain * at * þorbiorn * boroþur * sin * sun * þorstainʀ * i skytiki * kuþ * hiolbi * ant * ¶ * þorbiornaʀ *[4]
... [l]ét reisa stein at Þorbjôrn, bróður sinn, son Þorsteins í Skyttingi. Guð hjalpi ônd Þorbjarnar.[4]
... had the stone raised in memory of Þorbjôrn, his brother, Þorsteinn of Skyttingi's son. May God help Þorbjôrn's spirit.[4]