What ᚥ means
It is a modern sign for writing Latin w in runic transcription. In the 2009 Unicode proposal, ᚥ is listed under none of the historical rune traditions surveyed; its W label describes a modern transcription role.
Medieval runes are later additions to the Younger Futhark, a 16-rune alphabet used in Scandinavia.
Is ᚥ the Anglo-Saxon wynn?
No; the Anglo-Saxon wynn rune is ᚹ. Old English scribes used ᚹ for the w sound; it came from the Anglo-Frisian futhorc, the runic alphabet used for Old English and Old Frisian. In the older Elder Futhark, this rune was called Wunjo. The shared letter value does not make ᚹ and ᚥ the same character.
Don't confuse it with
1Questions people ask
1Why does ᚥ show as a box on some devices?
Because that device's fonts have no glyph for it. The character is still correct and still copies correctly — the box is a missing glyph, not a broken character.
How to type ᚥ
ᚥ\16A5Codes and encoding1 code points
A visible symbol can contain several code points. JS .length counts UTF-16 units; UTF-8 counts bytes.