What is the meaning of ᚾ?

A letter of the Runic alphabet, present in the Elder Fuþark (ᚾ), the Anglo-Saxon Fuþorc (ᚾ, called nyd), and the Younger Fuþark (ᚾ, called nauðr in Old Norse and naud in Icelandic), representing /n/ and associated with need and distress.

the tenth letter of the Old English runic alphabet, representing /n/ and pronounced nēod (“desire, need”)

Source: wiktionary.org