Tiwaz rune
The t-rune ᛏ is named after Týr, and was identified with this god. The reconstructed Proto-Germanic name is *Tîwaz or *Teiwaz.
Rune poems
Tiwaz is mentioned in all three rune poems. In the Icelandic and Norwegian poems, the rune is associated with the god Týr.
Usage
Multiple Tiwaz runes
Multiple Tiwaz runes either stacked atop one another to resemble a tree-like shape, or repeated after one another, appear several times in Germanic paganism:
The charm (alu) on the Lindholm amulet, dated from the 2nd to the 4th century, contains three consecutive t runes, which have been interpreted as an invocation of Týr.
The Kylver Stone (400 AD, Gotland) features 8 stacked Tiwaz runes at the end of an Elder Futhark inscription.
From 500 AD, a Scandinavian C-bracteate (Seeland-II-C) features an Elder Futhark inscription ending with three stacked Tiwaz runes.
Poetic Edda
According to the runologist Lars Magnar Enoksen, the Tiwaz rune is referred to in a stanza in Sigrdrífumál, a poem in the Poetic Edda.