smund Kresson invented the Uppland runestone style, which was used to write down Germanic languages; he listed himself as smundr Kri's son on some of his work.
Asmund is the inventor of the classic Uppland runestone style with one or two animals (rundjur) showing their heads in profile. In addition, in two inscriptions, U 956 in Vedyxa and Gs 11 in Jarvsta, Asmund listed his patronym with the text osmuntr kara sun or "Asmundr Kari's son." Most early medieval Scandinavians were probably literate in runes, and most people probably carved messages on pieces of bone and wood. Asmund was active mainly in Uppland, and about twenty runestones are signed by him and an additional thirty stones have been attributed to him. Most runestones are located in Scandinavia, but there are also scattered runestones in locations that were visited by Norsemen during the Viking Age. Runes are the letters in a set of related alphabets known as runic alphabets, which were used to write various Germanic languages before the adoption of the Latin alphabet and for specialised purposes thereafter. The Scandinavian variants are also known as futhark or fuark (derived from their first six letters of the alphabet: F, U, , A, R, and K); the Anglo-Saxon variant is futhorc or fuorc (due to sound-changes undergone in Old English by the names of those six letters). 
