The rune may have been an original innovation, or it may have been adapted from the Rhaetic's alphabet'sN.[1]
The valkyrie Sigrdrífa in Sigrdrífumál talks (to Sigurd) about the rune as a beer-rune and that
"You should learn beer-runes
if you don’t want another man’s wife
to abuse your trust if you have a tryst.
Carve them on the drinking-horn
and on the back of your hand,
and carve the rune ᚾ on your fingernail."