This article records tradition as it has been passed down and reported. Its sources are not yet part of the atlas's verified catalogue.
A Younger Futhark rune entry records one of the sixteen characters of the reduced runic row that replaced the older, twenty four character Elder Futhark in Scandinavia from around the eighth century onward, and that stayed in documented use throughout the Viking Age, distinct from the Anglo-Saxon futhorc the atlas records under its own separate type. This scholarly handbook is built from the documented epigraphic corpus itself, the surviving carved inscriptions, rather than from later reconstructions of what the runes might have meant.
An entry records a rune's documented sound value, its position within the sixteen character row, and how that same sound value was often written using more than one distinct rune shape, since the Younger Futhark reduced its character count even as spoken Old Norse retained more distinct sounds than sixteen runes could represent on their own.
An entry treats the historical, epigraphic evidence for a rune's use and form as its documented basis, keeping any later divinatory or magical use claimed by modern practitioners honestly separate, since that is a distinct, much later development that needs its own separate source rather than being read back into the inscriptional record.