Dagaz

The Dev  rune (ᛞ) is called dæg "day" in the Anglo-Saxon rune poem. The corresponding letter of the Gothic alphabet 𐌳 d is called dags. This rune is also part of the Elder Futhark, with a reconstructed Proto-Germanic name *dagaz.

Its "butterfly" shape is possibly derived from Lepontic san. The rune may have been an original innovation, or it may have been adapted from the Rhaetic's alphabet's D.

Rune poems
The name is only recorded in the Anglo-Saxon rune poem, since the rune was lost in the Younger Futhark:

Inscriptions
On runic inscription Ög 43 in Ingelstad, one Dagaz rune is translated using the Old Norse word for "day" as the personal name Dagr.