Södermanland Runic Inscription 270 or Sö 270 is the Rundata catalog number for a Viking Age memorial runic inscription that is located in Tyresta, which is about two kilometers east of Brandbergen, Stockholm County, Sweden, and is within the Tyresta National Park and the historic province of Södermanland.
Stenudd along with many others was close to the resident Japanese aikido teacher Toshikazu Ichimura but also had conflicts with him, which was part of the reasons for him starting his first own dojo in 1978, in the Stockholm suburb Brandbergen in Haninge.